Understanding Altitude Sickness
Altitude sickness, or Acute Mountain Sickness (AMS), occurs when your body can't adjust to lower oxygen levels at high elevations, typically above 8,000 feet. Symptoms often feel like a bad hangover: headache, nausea, dizziness, and fatigue. For most,
these are mild and manageable. However, AMS can progress to two life-threatening conditions: High-Altitude Cerebral Edema (HACE), a swelling of the brain, and High-Altitude Pulmonary Edema (HAPE), where fluid fills the lungs. Recognizing the early signs is the first step in preventing a medical emergency.
Prevention: Your First Line of Defence
The best strategy is to avoid getting sick in the first place. The golden rule is to ascend slowly, giving your body time to adapt. Once you are above 10,000 feet, try not to increase your sleeping altitude by more than 1,600 feet per day. Build rest days into your itinerary, especially after a significant gain in elevation. Staying hydrated is crucial; the dry air at altitude dehydrates you faster, so aim to drink much more water than usual. It's also wise to avoid alcohol for the first 48 hours at a new altitude, as it can worsen dehydration and mask symptoms.
Recognising the Red Flags
You must be honest with yourself and your travel companions about how you feel. A mild headache is common, but if it doesn't improve with rest or basic painkillers, pay close attention. The real danger begins when symptoms worsen. Watch for increased shortness of breath even at rest, a persistent cough (especially one that produces frothy or pink sputum), confusion, irritability, and loss of coordination, such as stumbling or being unable to walk in a straight line. These are signs of severe AMS, HAPE, or HACE and signal that it's time to act immediately.
Building Your Emergency Exit Plan
Before you even leave home, your exit strategy should be in place. Research your route and identify towns or villages at lower elevations you can retreat to. Know your transport options: are there reliable taxi services, or will you depend on local buses? Save contact numbers for local taxi operators and your hotel manager. Critically, invest in travel insurance that specifically covers high-altitude trekking and emergency medical evacuation. Helicopter rescues in the Himalayas can be incredibly expensive, and standard policies often don't cover them. Ensure your policy covers altitudes you plan to reach.
When to Descend: The Only Real Cure
If symptoms of AMS are mild, it’s okay to rest at your current altitude and see if you acclimatise. However, if your symptoms are moderate, getting worse, or if you show any signs of HACE or HAPE, you must descend immediately. Do not “tough it out” or continue climbing higher. Descent is the single most effective treatment for severe altitude sickness. Aim to go down at least 1,000 to 3,000 feet, or until symptoms begin to resolve. Even a descent of a few hundred metres can provide significant relief. Waiting until morning might be too late; if symptoms are severe, descending at night, while challenging, may be necessary.
