GS Paper II & III · Health · Social Issues · Science & Technology
Non-Communicable Diseases (NCDs)
Complete UPSC notes — Hypertension, Diabetes, Cardiovascular Diseases, Stroke, Cancer, Chronic Respiratory Diseases — with all 7 diagrams, India data, government programmes, PYQs, MCQs and Current Affairs.
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Overview — What Are NCDs?
Definition · Global burden · Four major NCDs · Key statistics
Definition
Non-Communicable Diseases (NCDs), also called chronic diseases, are not contagious (cannot spread from person to person). They develop slowly, often show no early symptoms, require treatment for years (sometimes lifelong), and are caused by a mix of genetic, physiological, environmental, and behavioural factors.
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Global Deaths
NCDs kill 41 million people/year — 71% of all deaths worldwide (WHO). The 4 major NCDs account for >80% of premature NCD deaths.
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Burden on Poor Nations
86% of the 17 million premature NCD deaths (before age 70) occur in low- and middle-income countries. India included.
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India Data
NCDs account for 66% of all deaths in India, with 22% being premature (before age 70). India will likely miss SDG 3.4 target of 1/3 reduction by 2030.
| NCD Type | Annual Global Deaths | % of NCD Deaths | Key Note |
|---|---|---|---|
| Cardiovascular Diseases (CVDs) | 17.9 million | ~44% | Heart attacks + Strokes. #1 killer worldwide. |
| Cancers | 9.3 million | ~23% | 2nd leading cause. 1.5 million new cases projected in India by 2035. |
| Chronic Respiratory Diseases | 4.1 million | ~10% | COPD, Asthma. Major role of air pollution. |
| Diabetes | 2.0 million | ~5% | Includes diabetes-related kidney disease. India = diabetes capital of world. |
NCD vs Communicable Disease — Key Difference
Communicable/Infectious diseases: Spread person-to-person (TB, COVID-19, cholera). Caused by pathogens (bacteria, viruses). Often acute.
Non-communicable diseases: Cannot spread person-to-person. Caused by lifestyle, genetics, environment. Usually chronic (long-lasting). Examples: diabetes, hypertension, cancer, heart disease.
Non-communicable diseases: Cannot spread person-to-person. Caused by lifestyle, genetics, environment. Usually chronic (long-lasting). Examples: diabetes, hypertension, cancer, heart disease.
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Risk Factors for NCDs
Non-modifiable · Modifiable · Intermediate · Outcomes
NCD Risk Factor Pathway. Left column: Non-Modifiable Risk Factors (cannot be changed) — Age, Sex, Family history (genetics). Middle-left column: Modifiable Health Risk Factors (can be changed through behaviour) — Unhealthy diets, Lack of physical activity, Tobacco use, Harmful use of alcohol, Environmental factors. These two categories combine to create Intermediate Risk Factors (middle column) — Hypertension, Impaired blood glucose levels (pre-diabetes), Hyperlipidaemia (high blood lipids/cholesterol), Overweight/Obesity. These intermediate factors then lead to the Outcomes (right column) — Cardiovascular diseases and Cerebrovascular diseases (Heart diseases and Stroke), Diabetes, Cancers, Chronic Respiratory Diseases (Asthma, difficulty breathing), Tooth decay/cavities, and Gum Diseases. This diagram is the conceptual framework for understanding how NCDs develop.
❌ Non-Modifiable Risk Factors
These cannot be changed — but knowing them helps in screening and early detection:
Age: Risk increases with age (arteries stiffen, cells accumulate damage)
Sex: Men have higher CVD risk; women have higher risk of certain cancers
Family history/Genetics: Inherited predisposition to hypertension, diabetes, certain cancers. First-degree relative with disease = doubled risk.
Age: Risk increases with age (arteries stiffen, cells accumulate damage)
Sex: Men have higher CVD risk; women have higher risk of certain cancers
Family history/Genetics: Inherited predisposition to hypertension, diabetes, certain cancers. First-degree relative with disease = doubled risk.
✅ Modifiable Risk Factors (Can Be Prevented)
Unhealthy diet: High salt, sugar, saturated fat; low fibre
Physical inactivity: Sedentary lifestyle (desk jobs, screen time)
Tobacco use: Smoking, smokeless tobacco — causes cancer, CVD, COPD
Harmful alcohol: Liver disease, cancer, CVD risk
Environmental factors: Air pollution, occupational hazards, UV radiation
Obesity/Overweight: BMI >25 raises risk of diabetes, CVD, cancer
Stress: Chronic stress → hypertension, immune suppression
Physical inactivity: Sedentary lifestyle (desk jobs, screen time)
Tobacco use: Smoking, smokeless tobacco — causes cancer, CVD, COPD
Harmful alcohol: Liver disease, cancer, CVD risk
Environmental factors: Air pollution, occupational hazards, UV radiation
Obesity/Overweight: BMI >25 raises risk of diabetes, CVD, cancer
Stress: Chronic stress → hypertension, immune suppression
Mnemonic — Common Modifiable Risk Factors (ABCDE)
Alcohol (harmful use) | Body weight (obesity) | Cigarettes/tobacco | Diet (unhealthy) | Exercise (lack of)
These 5 are the biggest lifestyle drivers of all major NCDs.
These 5 are the biggest lifestyle drivers of all major NCDs.
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Hypertension — The Silent Killer
Definition · BP threshold · Complications · India burden · IHCI
Definition
Hypertension (High Blood Pressure) is when the pressure in blood vessels is persistently ≥140/90 mmHg. The heart has to work harder than normal to pump blood — putting excessive strain on the heart and blood vessels. Called the "silent killer" because it often exists without any warning symptoms.
Hypertension Complications. Left: Normal blood vessel (wide lumen, RBCs flowing freely) vs damaged vessel from hypertension (narrow, stiff walls — RBCs cramped, hard to flow). Right: Body diagram showing the 4 major organs damaged by uncontrolled hypertension: (1) Brain → Stroke (high pressure ruptures or clots brain vessels); (2) Heart → Heart Attack (thickened heart muscle, coronary artery damage); (3) Kidneys → Kidney damage (tiny kidney vessels damaged → filtration fails → renal failure). Also causes: Eye damage (hypertensive retinopathy → blindness), Peripheral artery disease. This is why hypertension control prevents 4 major catastrophic events simultaneously.
Normal BP: 120/80 mmHg
Pre-hypertension: 120–139/80–89 mmHg
Hypertension: ≥140/90 mmHg
Hypertensive crisis: >180/120 mmHg (emergency)
Risk Factors: Advancing age, family history, obesity, unhealthy diet (high salt), lack of physical activity, tobacco, excessive alcohol, chronic stress, diabetes
Symptoms (when present): Headaches, blurred vision, chest pain, dizziness, difficulty breathing, nausea, abnormal heart rhythm — but mostly no symptoms at all
Pre-hypertension: 120–139/80–89 mmHg
Hypertension: ≥140/90 mmHg
Hypertensive crisis: >180/120 mmHg (emergency)
Risk Factors: Advancing age, family history, obesity, unhealthy diet (high salt), lack of physical activity, tobacco, excessive alcohol, chronic stress, diabetes
Symptoms (when present): Headaches, blurred vision, chest pain, dizziness, difficulty breathing, nausea, abnormal heart rhythm — but mostly no symptoms at all
Complications if uncontrolled:
→ Stroke (brain blood vessel rupture or clot)
→ Myocardial infarction (heart attack)
→ Cardiac failure (heart cannot pump enough)
→ Renal failure (kidney filtration damaged)
→ Blindness (retinal vessel damage)
India burden: 1 in 4 adults in India has hypertension. Only ~12% have it under control. 220+ million hypertensive people in India — one of the highest globally. High Yield
Govt response: Indian Hypertension Control Initiative (IHCI) — targets 25% relative reduction in hypertension prevalence by 2025.
→ Stroke (brain blood vessel rupture or clot)
→ Myocardial infarction (heart attack)
→ Cardiac failure (heart cannot pump enough)
→ Renal failure (kidney filtration damaged)
→ Blindness (retinal vessel damage)
India burden: 1 in 4 adults in India has hypertension. Only ~12% have it under control. 220+ million hypertensive people in India — one of the highest globally. High Yield
Govt response: Indian Hypertension Control Initiative (IHCI) — targets 25% relative reduction in hypertension prevalence by 2025.
📋 PYQ — UPSC PrelimsClassic
Hypertension is often called the "silent killer" because:
- (a) It causes sudden death without any prior illness
- (b) It often has no noticeable symptoms until it causes serious damage ✓ Correct
- (c) It is difficult to diagnose even with medical tests
- (d) It spreads silently from person to person
Explanation: Hypertension (BP ≥140/90 mmHg) is called the "silent killer" because it typically causes no noticeable symptoms in its early stages. A person can have dangerously high blood pressure for years without feeling unwell. By the time symptoms appear (like severe headache, vision problems, chest pain), serious organ damage may already have occurred — stroke, heart attack, kidney failure, or blindness. This is why regular blood pressure screening is essential, even for people who feel perfectly healthy. Option (d) is wrong — hypertension is a non-communicable disease and does NOT spread from person to person.
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Diabetes Mellitus
Type 1 vs Type 2 · Mechanism · India burden · Complications
Definition
Diabetes Mellitus is a chronic disease in which the pancreas fails to produce enough insulin, OR the body cannot effectively use the insulin it produces. Result: glucose accumulates in blood (hyperglycaemia). Diagnosis threshold: random blood glucose >140 mg/dL (or fasting >126 mg/dL).
Type 1 Diabetes Mechanism. Steps: ① Stomach converts food to glucose. ② Glucose enters the bloodstream (shown as blue dots). ③ The pancreas produces little or NO insulin (the key defect). ④ Without insulin as the "key," glucose cannot enter body cells effectively. ⑤ Glucose levels in blood increase dangerously (hyperglycaemia). The pancreas (bottom left of body) is essentially non-functional. This is an autoimmune disease — immune system destroys insulin-producing beta cells in the islets of Langerhans. Requires daily insulin injections to survive.
Type 2 Diabetes Mechanism. Steps: ① Stomach converts food to glucose. ② Glucose enters bloodstream. ③ The pancreas produces sufficient insulin (unlike T1D) — but the body's cells are resistant to insulin (shown as larger, unresponsive cells). ④ Even though insulin is present, glucose still cannot enter cells effectively. ⑤ Glucose levels increase. The critical difference from Type 1: insulin IS produced, but cells ignore it (insulin resistance). Associated with obesity, sedentary lifestyle, poor diet. Preventable through lifestyle changes.
| Feature | Type 1 Diabetes (T1DM) | Type 2 Diabetes (T2DM) |
|---|---|---|
| Cause | Autoimmune destruction of beta cells → NO insulin produced | Insulin resistance + insufficient insulin production |
| Age of onset | Usually childhood/adolescence ("juvenile diabetes") | Usually adult-onset (but increasingly in youth due to obesity) |
| % of cases | ~5–10% | ~90–95% (most common type) |
| Body weight | Usually lean/normal | Often overweight/obese |
| Insulin | Daily insulin injections essential for survival | Lifestyle change first; oral drugs; insulin later if needed |
| Prevention | Not preventable (cause unknown) | Preventable! Healthy diet, regular exercise, maintaining healthy weight |
| Cause known? | Neither cause nor prevention known | Strongly linked to lifestyle — largely preventable |
⚠️ Symptoms of Diabetes
Classic "3 Polys":
→ Polyuria — frequent urination (kidney excretes excess glucose with water)
→ Polydipsia — excessive thirst (from fluid loss)
→ Polyphagia — increased hunger (cells starved of glucose)
Other symptoms: Unexplained weight loss, extreme tiredness, slow wound healing, dry/itchy skin, blurred vision, recurrent infections
→ Polyuria — frequent urination (kidney excretes excess glucose with water)
→ Polydipsia — excessive thirst (from fluid loss)
→ Polyphagia — increased hunger (cells starved of glucose)
Other symptoms: Unexplained weight loss, extreme tiredness, slow wound healing, dry/itchy skin, blurred vision, recurrent infections
💀 Complications & India Burden
Major complications: Blindness (diabetic retinopathy), kidney failure (diabetic nephropathy), heart attacks, strokes, nerve damage (neuropathy), amputation of feet/legs
India: India is called the "Diabetes Capital of the World" — 77 million diabetics (2nd only to China). By 2045, projected 134 million. High Yield
Govt: NP-NCD (National Programme for Prevention & Control of NCDs); India Diabetes Risk Score; screening at health and wellness centres.
India: India is called the "Diabetes Capital of the World" — 77 million diabetics (2nd only to China). By 2045, projected 134 million. High Yield
Govt: NP-NCD (National Programme for Prevention & Control of NCDs); India Diabetes Risk Score; screening at health and wellness centres.
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Cardiovascular Diseases — Heart Attack & Stroke
CVD definition · Myocardial infarction · Ischemic vs Hemorrhagic stroke · FAST test
What are Cardiovascular Diseases (CVDs)?
CVDs are conditions affecting the heart or blood vessels. Associated with damage to arteries in organs like the brain, heart, kidneys, and eyes. #1 cause of death globally — 17.9 million deaths/year. The most common CVD is coronary heart disease (heart attack).
❤️ Heart Attack (Myocardial Infarction)
Heart Attack (Myocardial Infarction). Main image: The heart with coronary arteries visible. Circle inset (top right): A Block in Artery — the coronary artery is occluded (blocked) by a fatty plaque (atherosclerosis) + blood clot (thrombus). Below the blockage, no blood can flow. Result: The area of heart muscle beyond the block is starved of oxygen → Muscle Damage (shown as dark area at bottom of heart). If blood supply is not restored quickly (within 90 minutes ideally), heart muscle cells die permanently. The longer the delay, the more muscle dies ("time is muscle"). This is why the universal emergency number and rapid transport to a cath lab is critical.
Definition: Heart attack (Myocardial Infarction / MI) occurs when the heart's blood supply is blocked — usually by deposition of fat (atherosclerosis) + blood clot forming a blockage in coronary arteries.
Classic Definition: Severe chest pain >30 minutes, radiating to left arm, shoulder, or jaw, NOT relieved by painkillers.
Symptoms:
→ Chest pain/pressure/tightness
→ Pain radiating to left arm, jaw, back
→ Shortness of breath
→ Sweating, nausea
→ Light-headedness, feeling faint
→ Women may have atypical symptoms (fatigue, indigestion-like pain)
Risk factors: Hypertension, high cholesterol, diabetes, smoking, obesity, family history, stress, sedentary lifestyle
Complications: Arrhythmias, heart failure, cardiogenic shock, cardiac rupture (rare)
Classic Definition: Severe chest pain >30 minutes, radiating to left arm, shoulder, or jaw, NOT relieved by painkillers.
Symptoms:
→ Chest pain/pressure/tightness
→ Pain radiating to left arm, jaw, back
→ Shortness of breath
→ Sweating, nausea
→ Light-headedness, feeling faint
→ Women may have atypical symptoms (fatigue, indigestion-like pain)
Risk factors: Hypertension, high cholesterol, diabetes, smoking, obesity, family history, stress, sedentary lifestyle
Complications: Arrhythmias, heart failure, cardiogenic shock, cardiac rupture (rare)
🧠 Stroke (Brain Attack)
Two Types of Stroke. Type 1 — Ischemic Stroke (Blocked Artery): Left panel — A blood clot blocks an artery supplying part of the brain. Below the clot, brain tissue receives no oxygen. Result: Death of Brain Tissue (infarction — shown as pink area in brain cross-section). This is the more common type (~87% of strokes). Causes: atherosclerosis, blood clots, atrial fibrillation. Type 2 — Hemorrhagic Stroke (Ruptured Artery): Right panel — A blood vessel in the brain bursts (broken vessel). Blood leaks into brain tissue, increasing pressure and crushing neurons. Result: Haemorrhage (shown as red pooling in brain cross-section). Cause: hypertension (most common), aneurysm rupture. Both types cause loss of brain function in the affected region — paralysis, speech loss, vision loss depending on the area affected.
Definition: A stroke (brain attack) occurs when blood supply to part of the brain is cut off (ischemic) OR a brain vessel bursts (hemorrhagic). Brain cells begin dying within minutes without oxygen.
Global burden: Stroke is the world's 2nd leading cause of death and 3rd leading cause of disability. 1 in 4 people will have a stroke in their lifetime.
FAST Test (Emergency Recognition):
F — Face drooping (asymmetric smile)
A — Arm weakness (one arm drifts down)
S — Speech difficulty (slurred/strange)
T — Time to call emergency immediately
Global burden: Stroke is the world's 2nd leading cause of death and 3rd leading cause of disability. 1 in 4 people will have a stroke in their lifetime.
FAST Test (Emergency Recognition):
F — Face drooping (asymmetric smile)
A — Arm weakness (one arm drifts down)
S — Speech difficulty (slurred/strange)
T — Time to call emergency immediately
Types:
→ Ischemic stroke (~87%): Blood clot blocks brain artery → brain tissue infarction
→ Hemorrhagic stroke (~13%): Brain artery ruptures → blood floods brain tissue
Risk factors: High BP (most important), high cholesterol, diabetes, smoking, obesity, atrial fibrillation, family history
Prevention: BP control, no smoking, healthy diet, exercise, manage diabetes and cholesterol
Treatment window: Ischemic stroke — clot-dissolving drug (tPA) must be given within 4.5 hours of symptom onset. "Time is brain."
→ Ischemic stroke (~87%): Blood clot blocks brain artery → brain tissue infarction
→ Hemorrhagic stroke (~13%): Brain artery ruptures → blood floods brain tissue
Risk factors: High BP (most important), high cholesterol, diabetes, smoking, obesity, atrial fibrillation, family history
Prevention: BP control, no smoking, healthy diet, exercise, manage diabetes and cholesterol
Treatment window: Ischemic stroke — clot-dissolving drug (tPA) must be given within 4.5 hours of symptom onset. "Time is brain."
📋 PYQ — UPSC Prelims2019
Consider the following statements regarding cardiovascular diseases:
1. A heart attack occurs when the blood supply to part of the heart is blocked.
2. Stroke is the world's leading cause of death and disability.
3. High blood pressure is a major risk factor for both heart attack and stroke.
Which of the statements given above is/are correct?
1. A heart attack occurs when the blood supply to part of the heart is blocked.
2. Stroke is the world's leading cause of death and disability.
3. High blood pressure is a major risk factor for both heart attack and stroke.
Which of the statements given above is/are correct?
- (a) 1 and 2 only
- (b) 1 and 3 only ✓ Correct
- (c) 2 and 3 only
- (d) 1, 2 and 3
Explanation: Statement 1 ✓ — Heart attack (myocardial infarction) occurs when the blood supply to part of the heart is blocked, usually by fatty deposits (atherosclerosis) and a blood clot in a coronary artery. Statement 2 ✗ — Stroke is the world's 2nd leading cause of death (not 1st — cardiovascular disease is #1) and 3rd leading cause of disability. Statement 3 ✓ — Hypertension (high blood pressure) is one of the most important risk factors for both heart attack (by damaging artery walls, promoting atherosclerosis) and stroke (by rupturing brain vessels in hemorrhagic stroke, or promoting clot formation in ischemic stroke). Therefore, 1 and 3 are correct.
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Cancer — Uncontrolled Cell Division
Definition · Benign vs Malignant · Carcinogens · Types · India burden · HPV vaccine
Definition
Cancer is a disease in which cells divide uncontrollably in any part of the body, contrary to normal regulation by the immune system. This uncontrolled division leads to tumours (lumps or growths). Cancer-causing agents are called carcinogens; cancer-causing viruses are called oncogenic viruses.
Normal Cells — Organised, tightly packed layers of healthy skin cells. In normal tissue, cells divide in a controlled manner, maintain their shape and boundaries, and stop dividing when they reach neighbouring cells (contact inhibition). Cancer cells lose all these properties — they divide endlessly, lose their normal shape, ignore boundaries, invade neighbouring tissues, and can travel to distant sites (metastasis). Cancer is fundamentally a disease of cell cycle regulation failure.
| Feature | Benign Tumour | Malignant Tumour (Cancer) |
|---|---|---|
| Growth | Slow, localised | Rapid, invasive |
| Spread | Does NOT spread to other parts | Spreads via blood/lymph (metastasis) |
| Capsule | Usually encapsulated | No capsule — invades surrounding tissue |
| Recurrence after removal | Rarely recurs | May recur |
| Effect | Little damage; not life-threatening usually | Dangerous; can be fatal |
| Cell type | Normal-appearing cells | Abnormal cells (neoplastic/tumour cells) |
| Examples | Lipoma (fat tumour), uterine fibroid, adenoma | Carcinoma (epithelial), Sarcoma (connective tissue), Lymphoma, Leukaemia |
☢️ Types of Carcinogens (Cancer-Causing Agents)
Physical carcinogens:
→ Ultraviolet (UV) radiation — skin cancer
→ Ionising radiation (X-rays, gamma rays) — leukaemia, thyroid cancer
Chemical carcinogens:
→ Tobacco smoke (benzopyrene) — lung, oral, bladder cancer
→ Asbestos — mesothelioma (lung lining cancer)
→ Alcohol — liver, oral, oesophageal cancer
→ Aflatoxins (contaminated food) — liver cancer
Biological carcinogens (oncogenic agents):
→ HPV (Human Papillomavirus) — cervical cancer
→ HBV/HCV (Hepatitis B/C viruses) — liver cancer
→ Helicobacter pylori (bacterium) — stomach cancer
→ EBV (Epstein-Barr Virus) — lymphoma, nasopharyngeal cancer
→ Ultraviolet (UV) radiation — skin cancer
→ Ionising radiation (X-rays, gamma rays) — leukaemia, thyroid cancer
Chemical carcinogens:
→ Tobacco smoke (benzopyrene) — lung, oral, bladder cancer
→ Asbestos — mesothelioma (lung lining cancer)
→ Alcohol — liver, oral, oesophageal cancer
→ Aflatoxins (contaminated food) — liver cancer
Biological carcinogens (oncogenic agents):
→ HPV (Human Papillomavirus) — cervical cancer
→ HBV/HCV (Hepatitis B/C viruses) — liver cancer
→ Helicobacter pylori (bacterium) — stomach cancer
→ EBV (Epstein-Barr Virus) — lymphoma, nasopharyngeal cancer
🇮🇳 Cancer in India — Key Facts
ICMR-NCRP projection: New cancer cases in India to rise from ~1 million (2012) to >1.5 million by 2035.
Top cancers in India:
→ Women: Cervical cancer and Breast cancer (most common)
→ Men & Women: Oral cancer (linked to tobacco/betel nut use in India)
Cervical cancer: ~75,000 women in India die each year of cervical cancer. Caused by HPV (Human Papillomavirus). Preventable by HPV vaccine.
Govt initiative: India plans to implement HPV immunisation campaign for girls (9–14 years). Budget 2023 announced free HPV vaccine. CERVAVAC — India's indigenously developed HPV vaccine (Serum Institute, 2022). High Yield CA
Top cancers in India:
→ Women: Cervical cancer and Breast cancer (most common)
→ Men & Women: Oral cancer (linked to tobacco/betel nut use in India)
Cervical cancer: ~75,000 women in India die each year of cervical cancer. Caused by HPV (Human Papillomavirus). Preventable by HPV vaccine.
Govt initiative: India plans to implement HPV immunisation campaign for girls (9–14 years). Budget 2023 announced free HPV vaccine. CERVAVAC — India's indigenously developed HPV vaccine (Serum Institute, 2022). High Yield CA
📋 PYQ — UPSC Prelims2018
The term "oncogenic virus" refers to a virus that:
- (a) Is transmitted through blood transfusions only
- (b) Causes autoimmune diseases
- (c) Can cause cancer ✓ Correct
- (d) Is resistant to all known antiviral drugs
Explanation: "Onco" = tumour; "genic" = producing. An oncogenic virus is one that can cause cancer by transforming normal cells into cancerous (neoplastic) cells. Examples: HPV (Human Papillomavirus) causes cervical cancer, penile cancer, and oropharyngeal cancer; Hepatitis B and C viruses cause liver cancer; Epstein-Barr Virus (EBV) causes Burkitt's lymphoma and nasopharyngeal carcinoma; Human T-cell Lymphotropic Virus (HTLV-1) causes adult T-cell leukaemia. These are classified as biological carcinogens. The HPV vaccine prevents infection by the most common cancer-causing HPV strains (16 and 18), thereby preventing cervical cancer.
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Chronic Respiratory Diseases (CRDs)
COPD · Asthma · Risk factors · Air pollution link · India burden
Definition
Chronic Respiratory Diseases (CRDs) are long-term conditions affecting the airways and lung structures. They are not curable, but treatable to control symptoms and improve quality of life. The most common are: Chronic Obstructive Pulmonary Disease (COPD), Asthma, Occupational lung diseases, and Pulmonary hypertension.
🌬️ COPD (Chronic Obstructive Pulmonary Disease)
Progressive disease causing breathing difficulty due to blocked/narrowed airways. Includes chronic bronchitis (inflamed airways, excess mucus) + emphysema (damaged air sacs).
Main cause: Long-term tobacco smoking (most important); biomass fuel burning (wood, dung — common in rural India); occupational dust and chemicals
Symptoms: Chronic cough, excessive mucus, breathlessness, wheezing
India: 3rd largest cause of death in India; heavily linked to indoor air pollution from biomass cooking fuels (used by 700 million+ Indians).
Govt: PM Ujjwala Yojana — LPG gas connections to BPL households to reduce biomass fuel use → reduces indoor air pollution → reduces COPD. CA
Main cause: Long-term tobacco smoking (most important); biomass fuel burning (wood, dung — common in rural India); occupational dust and chemicals
Symptoms: Chronic cough, excessive mucus, breathlessness, wheezing
India: 3rd largest cause of death in India; heavily linked to indoor air pollution from biomass cooking fuels (used by 700 million+ Indians).
Govt: PM Ujjwala Yojana — LPG gas connections to BPL households to reduce biomass fuel use → reduces indoor air pollution → reduces COPD. CA
🤧 Asthma
Chronic inflammation of airways causing reversible narrowing → episodes of wheezing, breathlessness, chest tightness.
Triggers: Allergens (pollen, dust, pet dander), air pollution, cold air, exercise, respiratory infections, stress
Difference from COPD: Asthma is reversible (airways open up with medication); COPD is progressive and largely irreversible
Treatment: Inhalers — bronchodilators (relieve attack) + corticosteroids (prevent inflammation)
India: ~30 million asthma patients in India. Urban air pollution and indoor allergens are major drivers.
Link to climate change: Rising temperatures and CO₂ increase pollen production and air pollutants → worsening asthma globally. CA
Triggers: Allergens (pollen, dust, pet dander), air pollution, cold air, exercise, respiratory infections, stress
Difference from COPD: Asthma is reversible (airways open up with medication); COPD is progressive and largely irreversible
Treatment: Inhalers — bronchodilators (relieve attack) + corticosteroids (prevent inflammation)
India: ~30 million asthma patients in India. Urban air pollution and indoor allergens are major drivers.
Link to climate change: Rising temperatures and CO₂ increase pollen production and air pollutants → worsening asthma globally. CA
Air Pollution & CRDs — The Critical Link for UPSC
India's air quality crisis directly worsens CRDs: PM2.5 particles penetrate deep into lungs causing inflammation. COPD and asthma are both heavily driven by air pollution. WHO estimates 7 million deaths/year from air pollution globally. India's AQI frequently exceeds safe limits, especially in Delhi and Indo-Gangetic Plain. National Clean Air Programme (NCAP) launched 2019 — targets 20–30% reduction in PM2.5 and PM10 by 2024 compared to 2017 baseline. High Yield
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India & NCDs — Data, Programmes & Current Affairs
NP-NCD · IHCI · NTCP · SDG · Double burden · Recent developments
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India NCD Burden
NCDs = 66% of all deaths in India. 22% are premature (before age 70). India will miss SDG 3.4 target (1/3 reduction in premature NCD deaths by 2030) — projected only 15.6% reduction.
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Double Burden
India faces a "double burden" — still fighting communicable diseases (TB, malaria) while NCDs are rapidly rising. Rural areas have both; urban areas more NCD-heavy. Massive strain on healthcare.
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SDG Target 3.4
Reduce premature mortality from NCDs by 1/3 by 2030 through prevention, treatment, and mental health promotion. India is off-track as per projections.
| Programme | Ministry/Year | Target/Focus | Key Feature |
|---|---|---|---|
| NP-NCD (National Programme for Prevention & Control of NCDs) — formerly NPCDCS | Health Ministry / 2010 | Hypertension, Diabetes, CVD, Cancer, Stroke | Implemented via NHM. Infrastructure strengthening, early detection, management, referral. Covers 14 NCDs now. |
| Indian Hypertension Control Initiative (IHCI) | Health Ministry / 2017 | 220+ million hypertensive Indians | Target: 25% relative reduction in hypertension prevalence by 2025. Standardised treatment protocol. Collaboration with WHO, Resolve to Save Lives. |
| National Tobacco Control Programme (NTCP) | Health Ministry / 2007–08 | Reduce tobacco use | Discourages tobacco especially in youth. Supports COTPA (Cigarettes and Other Tobacco Products Act). Graphic health warnings on tobacco packs. |
| NPCDCS → NP-NCD | Health Ministry | Cancer screening | Screening for oral, breast, and cervical cancers at Community Health Centres. Goal: early detection = higher cure rates. |
| PM Ujjwala Yojana | Petroleum Ministry / 2016 | Rural women/BPL households | Free LPG connections → reduces biomass fuel burning → reduces indoor air pollution → reduces COPD/CRD burden. Indirect NCD intervention. CA |
| Fit India Movement | Sports Ministry / 2019 | Whole population | Encourages physical activity and sports to combat lifestyle NCDs. Launched on National Sports Day (Aug 29). CA |
| Eat Right India | FSSAI / 2018 | Reduce NCD risk through food | Promotes healthy, safe food choices. Includes fortified foods, reduced salt/sugar/fat campaigns, clean street food hubs. CA |
🔬 Current Affairs 2024–2025 — NCDs
GLP-1 agonists (Ozempic/Wegovy — Semaglutide): Revolutionary new class of diabetes + obesity drugs. Originally diabetes drugs that also cause significant weight loss. Approved for obesity treatment. Could transform NCD management. India developing affordable generic versions. High Yield CA
CERVAVAC (HPV vaccine, India): Serum Institute's indigenous HPV vaccine approved 2022. Far cheaper than imported vaccines (~₹200 vs ₹3000+). Union Budget 2023 announced free HPV vaccination for girls 9–14 years. WHO pre-qualified 2023. CA
India's NCD-related SDG 3 progress: India's Lancet Countdown 2023 report highlights worsening NCD burden with climate change — heat stress worsening cardiovascular and respiratory diseases.
CERVAVAC (HPV vaccine, India): Serum Institute's indigenous HPV vaccine approved 2022. Far cheaper than imported vaccines (~₹200 vs ₹3000+). Union Budget 2023 announced free HPV vaccination for girls 9–14 years. WHO pre-qualified 2023. CA
India's NCD-related SDG 3 progress: India's Lancet Countdown 2023 report highlights worsening NCD burden with climate change — heat stress worsening cardiovascular and respiratory diseases.
Cancer new treatments: CAR-T cell therapy approved in India 2024 (NexCAR19 — first indigenous CAR-T). Gene therapy for certain cancers. mRNA cancer vaccines in trials (personalised cancer vaccines — Moderna + Merck). High Yield CA
COTPA Amendment 2023: Proposed amendments to Cigarettes and Other Tobacco Products Act — raise smoking age to 21, expand plain packaging, ban on flavoured tobacco products — to reduce tobacco-related NCDs.
PM Ayushman Bharat Health Infrastructure Mission: Building Health and Wellness Centres (HWCs) that provide NCD screening (diabetes, hypertension, cancer) at primary level. 1.5 lakh HWCs target. CA
COTPA Amendment 2023: Proposed amendments to Cigarettes and Other Tobacco Products Act — raise smoking age to 21, expand plain packaging, ban on flavoured tobacco products — to reduce tobacco-related NCDs.
PM Ayushman Bharat Health Infrastructure Mission: Building Health and Wellness Centres (HWCs) that provide NCD screening (diabetes, hypertension, cancer) at primary level. 1.5 lakh HWCs target. CA
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Practice MCQs — Non-Communicable Diseases
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Q1. According to WHO, which is the single biggest cause of NCD deaths globally, accounting for 17.9 million deaths per year?
- (a) Cardiovascular diseases (CVDs)
- (b) Cancers
- (c) Diabetes
- (d) Chronic respiratory diseases
Cardiovascular diseases (CVDs) — heart attacks and strokes — are the world's #1 NCD killer, causing 17.9 million deaths per year according to WHO. The ranking is: CVDs (17.9 million) → Cancers (9.3 million) → Chronic Respiratory Diseases (4.1 million) → Diabetes (2.0 million including kidney disease deaths). Together, these 4 major NCDs account for over 80% of all premature NCD deaths worldwide. India-specific: NCDs account for 66% of all deaths in India, with CVDs being the leading cause here too. This ranking (CVD → Cancer → CRD → Diabetes) is a frequently tested UPSC fact.
Q2. What is the key difference between Type 1 and Type 2 Diabetes?
- (a) Type 1 affects adults; Type 2 affects only children
- (b) Type 1 is caused by diet; Type 2 is caused by a virus
- (c) In Type 1, the body produces NO insulin; in Type 2, insulin is produced but cells are resistant to it
- (d) Type 1 is preventable through vaccination; Type 2 is not preventable
Type 1 Diabetes (T1DM): An autoimmune disease where the immune system destroys insulin-producing beta cells in the pancreas → the body produces NO insulin at all. Requires daily insulin injections for survival. Cause unknown; cannot be prevented. Usually develops in childhood/adolescence. Type 2 Diabetes (T2DM): The pancreas produces insulin, but body cells develop insulin resistance — they cannot use the insulin effectively. Most common type (~90-95%). Strongly linked to obesity, sedentary lifestyle, unhealthy diet. Largely preventable through lifestyle changes. India has ~77 million diabetics, making it the "Diabetes Capital of the World." Option (d) is wrong — T1DM is NOT vaccine-preventable (no known cause/prevention); T2DM is preventable through lifestyle.
Q3. "FAST" is an acronym used to recognise which medical emergency?
- (a) Heart attack (Myocardial Infarction)
- (b) Stroke (Brain attack)
- (c) Diabetic emergency (hypoglycaemia)
- (d) Asthma attack
FAST stands for Face drooping, Arm weakness, Speech difficulty, Time to call emergency — it is the standard tool for recognising a stroke (brain attack). Stroke is a time-critical emergency — "time is brain." Every minute of delay destroys nearly 2 million neurons. For ischemic stroke, the clot-dissolving drug (tPA) must be given within 4.5 hours of symptom onset. Stroke is the world's 2nd leading cause of death and 3rd leading cause of disability. Types: Ischemic (blood clot blocks brain artery — 87%) and Hemorrhagic (blood vessel bursts — 13%). High blood pressure is the single most important risk factor for stroke.
Q4. The "Indian Hypertension Control Initiative (IHCI)" targets a 25% reduction in hypertension prevalence by 2025. Approximately how many Indians currently have hypertension?
- (a) 50 million
- (b) 100 million
- (c) 220 million
- (d) 400 million
India has over 220 million people with hypertension — one of the highest absolute numbers globally. At least 1 in 4 adults in India has hypertension, but only about 12% have it under control. Hypertension is the "silent killer" — most people don't know they have it, and even those diagnosed don't consistently take medication. The IHCI (Indian Hypertension Control Initiative) was launched to address this — aiming for 25% relative reduction in hypertension prevalence by 2025 through standardised treatment protocols, free medicines, regular follow-up, and community-level screening. If uncontrolled, hypertension causes stroke, heart attack, kidney failure, and blindness — making BP control one of the highest-impact health interventions.
Q5. Which of the following cancers in India is directly preventable through vaccination?
- (a) Cervical cancer — by the HPV vaccine
- (b) Breast cancer — by the BRCA vaccine
- (c) Oral cancer — by the tobacco cessation vaccine
- (d) Lung cancer — by the BCG vaccine
Cervical cancer is preventable through the HPV (Human Papillomavirus) vaccine. Cervical cancer is caused by persistent infection with high-risk HPV strains (mainly HPV 16 and 18). The HPV vaccine (e.g., Gardasil, Cervarix, and India's CERVAVAC) prevents infection by these cancer-causing strains. India loses ~75,000 women to cervical cancer annually — it is the 2nd most common cancer among Indian women. Union Budget 2023 announced free HPV vaccination for girls aged 9–14 years in India. CERVAVAC (Serum Institute of India's quadrivalent HPV vaccine) was approved in 2022 and WHO pre-qualified in 2023 — much cheaper than imported vaccines. This makes cervical cancer one of the few cancers that is both preventable by vaccination and detectable early by screening (Pap smear, HPV test).
Q6. Which of the following best describes the difference between an ischemic stroke and a hemorrhagic stroke?
- (a) Ischemic stroke occurs in the heart; hemorrhagic stroke occurs in the brain
- (b) Ischemic stroke is more dangerous; hemorrhagic stroke is mild
- (c) Ischemic stroke is caused by high BP; hemorrhagic stroke is caused by diabetes
- (d) Ischemic stroke is caused by a blood clot blocking a brain artery; hemorrhagic stroke occurs when a brain artery ruptures
Ischemic stroke (~87% of all strokes): A blood clot (thrombus or embolus) blocks a blood vessel in the brain → the area beyond the clot receives no blood/oxygen → brain tissue dies (infarction). Can be treated with clot-dissolving drugs (tPA) if given within 4.5 hours. Hemorrhagic stroke (~13% of strokes): A blood vessel in the brain bursts/ruptures → blood floods into brain tissue → increased pressure damages neurons → haemorrhage. Most commonly caused by uncontrolled hypertension or an aneurysm (balloon-like bulge in a vessel) rupturing. Cannot use clot-dissolving drugs for this type. Stroke is globally the 2nd leading cause of death and 3rd leading cause of disability. Option (a) is wrong — both occur in the brain, not the heart. Option (c) is wrong — both types can be associated with hypertension.
⚡ Quick Revision — Non-Communicable Diseases
| Topic | Key Facts for UPSC |
|---|---|
| Definition | NCDs = non-contagious, chronic, slow onset. Caused by genetic + physiological + environmental + behavioural factors. 4 major types: CVD, Cancer, CRD, Diabetes. |
| Global burden | NCDs kill 41 million/year = 71% of all global deaths. CVDs (17.9M) → Cancer (9.3M) → CRD (4.1M) → Diabetes (2M). 86% of premature NCD deaths in low-middle income countries. |
| India burden | NCDs = 66% of all deaths; 22% premature. India will miss SDG 3.4. "Double burden" — still fighting infectious diseases too. |
| Risk factors | Non-modifiable: Age, sex, family history. Modifiable: Unhealthy diet, inactivity, tobacco, alcohol, obesity, stress. Intermediate: Hypertension, impaired blood glucose, hyperlipidaemia, overweight/obesity. |
| Hypertension | BP ≥140/90 mmHg. "Silent killer" — no symptoms. Causes: Stroke, MI, renal failure, blindness. India: 1 in 4 adults affected; only 12% controlled. IHCI targets 25% reduction by 2025. |
| Diabetes | T1DM: no insulin (autoimmune), daily insulin needed, not preventable. T2DM: insulin resistance, preventable by lifestyle. India = diabetes capital (77M). Complications: Blindness, kidney failure, heart attack, stroke. "3 Polys" = polyuria, polydipsia, polyphagia. |
| Heart Attack (MI) | Coronary artery blocked by fat + clot → heart muscle starved → dies. Severe chest pain >30 min, radiating to left arm/jaw. Complications: Arrhythmia, heart failure, cardiogenic shock. "Time is muscle." |
| Stroke | 2nd leading cause of death globally; 3rd leading disability. Ischemic (87% — clot) vs Hemorrhagic (13% — rupture). FAST test. 4.5-hour window for tPA. High BP = biggest risk factor. |
| Cancer | Uncontrolled cell division. Benign (confined, non-invasive) vs Malignant (metastasis). Carcinogens: Physical (UV, radiation), Chemical (tobacco, asbestos), Biological (HPV, HBV, H. pylori). India: Cervical + Breast (women), Oral (all). Cervical cancer: HPV vaccine preventable. 75,000 deaths/year India. CERVAVAC (India's HPV vaccine). Cases to hit 1.5M by 2035. |
| CRDs | COPD (irreversible — tobacco, biomass fuel) vs Asthma (reversible — allergens, pollution). Not curable, only managed. Air pollution key driver in India. NCAP targets 20–30% PM reduction. PM Ujjwala Yojana reduces biomass burning → reduces COPD. |
| Government Programmes | NP-NCD (2010, via NHM — umbrella for all NCDs), IHCI (hypertension), NTCP (tobacco control), Fit India Movement, Eat Right India (FSSAI), PM Ujjwala Yojana, Ayushman Bharat HWCs (NCD screening). |
| Current Affairs | CERVAVAC (India HPV vaccine 2022, free for girls 9–14 from Budget 2023), GLP-1 agonists (semaglutide — diabetes + obesity game-changer), CAR-T therapy in India 2024 (NexCAR19), mRNA cancer vaccines in trials, COTPA amendment proposals, climate change worsening NCDs. |
🚨 5 UPSC TRAPS — NCDs:
Trap 1 — "NCDs are the minority cause of death globally" → WRONG! NCDs kill 71% of all people who die globally — they are the MAJORITY, not minority, cause of death. 41 million people/year. Communicable diseases (infectious diseases) are now a minority of global deaths, though still dominant in some low-income countries including pockets of India. This reversal catches students off-guard.
Trap 2 — "Stroke is the world's LEADING cause of death" → WRONG! Stroke is the world's 2nd leading cause of DEATH and 3rd leading cause of DISABILITY. The #1 cause of death globally is ischaemic heart disease (coronary heart disease/heart attack), not stroke. Together they are both CVDs — CVDs as a category ARE #1. But individually, heart attack kills more than stroke.
Trap 3 — "Type 1 Diabetes is preventable by lifestyle changes" → WRONG! Type 2 Diabetes is preventable through healthy diet, exercise, and weight management. Type 1 Diabetes is NOT preventable — its cause (autoimmune destruction of beta cells) and means of prevention are both unknown. Students frequently confuse T1DM and T2DM prevention. Only T2DM (the 90–95% common type) responds to lifestyle interventions.
Trap 4 — "A malignant tumour stays confined to one location" → WRONG! BENIGN tumours are confined to their original site and do not spread. Malignant tumours (cancers) are characterized by metastasis — spreading to distant organs through blood and lymph vessels. This is the key feature that makes malignant tumours life-threatening. The reversal of benign/malignant properties is a classic UPSC trap.
Trap 5 — "Ischemic stroke is treated by stopping all blood flow to the brain" → WRONG! Ischemic stroke is treated by RESTORING blood flow — using clot-dissolving drugs (tPA/thrombolytics) within 4.5 hours, or mechanical clot removal (thrombectomy). The goal is to unblock the artery as fast as possible ("time is brain"). Hemorrhagic stroke (ruptured vessel) CANNOT use clot-dissolving drugs — that would worsen the bleeding. The treatment for these two stroke types is opposite — UPSC may test which treatment applies to which type.
Trap 1 — "NCDs are the minority cause of death globally" → WRONG! NCDs kill 71% of all people who die globally — they are the MAJORITY, not minority, cause of death. 41 million people/year. Communicable diseases (infectious diseases) are now a minority of global deaths, though still dominant in some low-income countries including pockets of India. This reversal catches students off-guard.
Trap 2 — "Stroke is the world's LEADING cause of death" → WRONG! Stroke is the world's 2nd leading cause of DEATH and 3rd leading cause of DISABILITY. The #1 cause of death globally is ischaemic heart disease (coronary heart disease/heart attack), not stroke. Together they are both CVDs — CVDs as a category ARE #1. But individually, heart attack kills more than stroke.
Trap 3 — "Type 1 Diabetes is preventable by lifestyle changes" → WRONG! Type 2 Diabetes is preventable through healthy diet, exercise, and weight management. Type 1 Diabetes is NOT preventable — its cause (autoimmune destruction of beta cells) and means of prevention are both unknown. Students frequently confuse T1DM and T2DM prevention. Only T2DM (the 90–95% common type) responds to lifestyle interventions.
Trap 4 — "A malignant tumour stays confined to one location" → WRONG! BENIGN tumours are confined to their original site and do not spread. Malignant tumours (cancers) are characterized by metastasis — spreading to distant organs through blood and lymph vessels. This is the key feature that makes malignant tumours life-threatening. The reversal of benign/malignant properties is a classic UPSC trap.
Trap 5 — "Ischemic stroke is treated by stopping all blood flow to the brain" → WRONG! Ischemic stroke is treated by RESTORING blood flow — using clot-dissolving drugs (tPA/thrombolytics) within 4.5 hours, or mechanical clot removal (thrombectomy). The goal is to unblock the artery as fast as possible ("time is brain"). Hemorrhagic stroke (ruptured vessel) CANNOT use clot-dissolving drugs — that would worsen the bleeding. The treatment for these two stroke types is opposite — UPSC may test which treatment applies to which type.
