Altitude Sickness Risk Estimator

AMS is the body's response to reduced oxygen at altitude. It typically begins 6–12 hours after arriving at high altitude. Symptoms include headache, nausea, fatigue, dizziness, and loss of appetite. Most cases are mild and resolve with rest and acclimatisation.

Ascend gradually (maximum 300–500m per day above 2,500m). Schedule acclimatisation days (rest days) every 2–3 days. Stay hydrated. Avoid alcohol in the first 48 hours. Consider Diamox (acetazolamide) as prescribed by a doctor. Do not fly directly to altitudes above 3,500m without a rest day.

Surprisingly, high cardiovascular fitness provides limited protection against AMS. The key factor is the rate of ascent, not fitness. Even elite athletes can get AMS if they ascend too fast. However, good fitness helps you manage the physical exertion better.

Descend immediately if you experience: severe headache not relieved by pain relief, vomiting, loss of coordination (ataxia), confusion or altered mental state, or shortness of breath at rest. These are signs of High Altitude Cerebral Edema (HACE) or High Altitude Pulmonary Edema (HAPE), which are life-threatening.

Flying directly to Leh (3,500m) from sea-level cities is common but carries AMS risk. Rest completely for the first 24–48 hours after arrival. Avoid alcohol, exertion and sleeping pills. Drink plenty of water. Most healthy adults acclimatise within 2–3 days if they rest adequately.