Recognising the Early Warning Signs
Altitude sickness, or Acute Mountain Sickness (AMS), is your body’s way of telling you it’s not getting enough oxygen. This happens because the air is thinner at higher elevations. The symptoms often mimic a bad hangover and typically appear within hours
of ascending, especially above 8,000 feet. The cardinal symptom is a headache. This is often accompanied by one or more of the following: nausea or vomiting, loss of appetite, fatigue or weakness, dizziness, and difficulty sleeping. It’s crucial to acknowledge these symptoms, no matter how minor they seem. They are not a sign of weakness, but a critical physiological warning that your body needs time to adjust.
Why Pushing Forward Is So Dangerous
Continuing to climb higher with symptoms of AMS can lead to life-threatening conditions. Your mild headache and fatigue can rapidly escalate into High-Altitude Cerebral Edema (HACE) or High-Altitude Pulmonary Edema (HAPE). HACE is a swelling of the brain. Its signs include confusion, irrational behaviour, loss of coordination (ataxia), and severe lethargy. A simple test is to see if the person can walk a straight line; if they can't, HACE is a strong possibility. HAPE involves fluid filling the lungs, preventing oxygen from getting into your bloodstream. Key symptoms are extreme shortness of breath even at rest, a persistent cough that may produce pink, frothy sputum, chest tightness, and blue lips or fingernails. Both HACE and HAPE are medical emergencies that can be fatal within hours if not treated immediately.
The Golden Rule: Stop and Descend
If you or someone in your party exhibits symptoms of altitude sickness, the first and most important rule is to stop ascending. Do not go any higher until the symptoms have completely resolved. Often, resting at the current altitude for a day or two is enough for mild symptoms to subside as your body acclimatizes. However, if symptoms worsen or do not improve with rest, descent is mandatory. Descending is the definitive cure for all forms of altitude sickness. A descent of just 300 to 500 meters can bring remarkable improvement. It is never safe to continue upward in the hope that you will “walk it off” or feel better at the next camp. The mountain isn't going anywhere, and waiting or descending is the only responsible choice.
Smart Strategies for Safe Acclimatization
Prevention is always the best medicine. The key to avoiding altitude sickness is giving your body enough time to adjust to the lower oxygen levels, a process called acclimatization. A primary rule is to ascend gradually. Once above 3,000 meters (about 9,850 feet), try not to increase your sleeping altitude by more than 500 meters per night. For every 1,000 meters gained, plan to take a rest day to acclimatize. The old mountaineering adage, “climb high, sleep low,” is excellent advice; this involves climbing to a higher altitude during the day and descending to a lower elevation to sleep. Staying well-hydrated by drinking three to four litres of fluid daily is also vital. Finally, avoid alcohol and smoking, as they can interfere with acclimatization and worsen symptoms.
