🧒 Infants (0–1 year)
Body systems still developing → infections & congenital problems
| Common diseases | Why |
|---|---|
| Immune system immature | |
| Lungs not fully developed | |
| Birth defects | |
| Liver immaturity | |
| Sensitive gut & infections |
Doctor thinking: Any fever in newborn = emergency
👶 Toddlers (1–5 years)
Exploring environment → infections spread easily
| Common diseases | Why |
|---|---|
| Viral exposure | |
| Daycare spread | |
| Short ear tubes | |
| Hygiene habits | |
| Weak immunity |
Doctor thinking: cough + fever → infection first
🧑 Children (6–12 years)
School exposure + growth phase
| Common diseases | Why |
|---|---|
| Allergic airway sensitivity | |
| Repeated infections | |
| Mosquito exposure | |
| Contaminated food/water | |
| Neurodevelopmental detection age |
Doctor thinking: recurrent fever → think infection vs allergy
🧑🎓 Teenagers (13–19 years)
Hormones + behavior changes
| Common diseases | Why |
|---|---|
| Hormonal oil production | |
| Rapid growth, menstruation | |
| Brain emotional maturation | |
| Hormonal imbalance | |
| Neurovascular sensitivity |
Doctor thinking: unexplained fatigue → check anemia first
🧑 Adults (20–40 years)
Lifestyle diseases begin
| Common diseases | Why |
|---|---|
| Stress + irregular food | |
| High exposure age in India | |
| Work/social stress | |
| Diet + dehydration | |
| Sexual activity |
Doctor thinking: chest pain → not always heart, often acidity/anxiety
👨🦳 Middle Age (40–60 years)
Metabolism declines → chronic disease appears
| Common diseases | Why |
|---|---|
| Insulin resistance | |
| Vessel stiffness | |
| Obesity/metabolic syndrome | |
| Hormonal decline | |
| Plaque buildup |
Doctor thinking: silent diseases — screen even without symptoms
👴 Elderly (60+ years)
Degeneration & cell aging
| Common diseases | Why |
|---|---|
| Joint wear | |
| Brain degeneration | |
| Dopamine neuron loss | |
| Vessel blockage/rupture | |
| Age-related growth |
Doctor thinking: multiple diseases together (multimorbidity)
Big medical insight
Medicine is not random.
Age predicts disease probability.
Doctors subconsciously run this equation:
Symptoms + Age + Risk factors → Most likely diagnosis