Altitude Sickness Explained: Symptoms, Prevention, and Acclimatization¶

Altitude sickness can strike anyone regardless of fitness level. This guide explains the physiology of altitude, the three levels of altitude illness (AMS, HACE, HAPE), and proven acclimatization strategies. Learn the "climb high, sleep low" principle and when medication like Diamox is appropriate.

Introduction¶

Why Altitude Affects Everyone¶

How Your Body Responds to Altitude¶

Oxygen Levels at Different Elevations¶

Altitude Zones — Moderate, High, Very High, Extreme¶

Acute Mountain Sickness (AMS)¶

Symptoms and Severity Scale¶

Risk Factors¶

Severe Altitude Illness¶

HACE — High Altitude Cerebral Edema¶

HAPE — High Altitude Pulmonary Edema¶

When Descent Is the Only Treatment¶

Acclimatization Strategies¶

Climb High, Sleep Low¶

Recommended Ascent Rates¶

Rest Days and Active Acclimatization¶

Medication and Prevention¶

Acetazolamide (Diamox)¶

Hydration and Nutrition at Altitude¶

Altitude Decision Framework¶

When to Continue, Rest, or Descend¶