Acute Mountain Sickness

Acute Mountain Sickness

At least three trekkers die per year from AMS, usually known as high altitude sickness is a most important medical concern while trekking in high Himalayas of Nepal. High altitude sickness means the effect of altitude on those who ascend fast to the elevations above 2500 meter (8200ft). The occurrence of AMS generally known as Acute Mountain Sickness is dependent upon the elevation, the rate of ascent, and individual susceptibility. Many people will experience mild symptoms of Acute Mountain Sickness during the acclimatization process and this is actually more common in fit young people because they are more likely to try a fast climb by racing up the mountain like some indestructible super hero!
Some people are more vulnerable to altitude than others. If you know you get altitude sickness easily, you just have to adjust your acclimatization schedule accordingly or use preventive medicine (Diamox/Acetazolamide) Awareness of altitude sickness has caused some trekkers to be unnecessarily anxious as they trek. As a general rule, it is always recommended to walk gently for safer and more enjoyable trek and avoid high altitude sickness by planning a sensible itinerary that allows for steady acclimatization to altitude as you climb up, but you could run back down as fast as you like!
Our body has the ability to adjust to higher altitudes if given enough time. This process of adaption is called acclimatization. Altitude illness occurs as the result of failure to adapt to a higher altitude. Fluid begins to leak from blood vessels, most often in the brain or in the lungs. If fluids collect the lungs, you become breathless more easily while walking. A cough begins firstly dry and irritative, but progressing to the production of pink, frothy sputum in its most severe form. The person ultimately drowns in this fluid if he/she doesn't go down. This symptom is referred to as high altitude pulmonary oedema (HAPE). When fluid leaks in brain, you initially develop a headache, loss of appetite, nausea and something vomiting, this symptom is referred to acute mountain sickness (AMS). If you become more tired and you like to lie down and do nothing, as you lose coordination and eventually you sleep in coma and death is inevitable if you don't descend immediately. This syndrome is called (HACE). HAPE and HACE can occur alone or in combinations.
The flowing are the main symptoms of AMS:

  • Nausea, vomiting, Loss of appetite.
  • Disturbed sleep/Insomnia, persistent headache.
  • Dizziness, light headedness, confusion, disorientation, drunken gait.
  • Weakness, fatigue, lassitude, heavy legs, slight swelling of hands and face.
  • Shortness of breath and breathing irregularity, reduced urine output.
  • General feeling of malaise


These symptoms are must be taken very seriously. In case of an appearance of any of the above mentioned symptoms any further ascent should be avoided otherwise more serious, even life-threatening troubles may happen. The only cure for Altitude Sickness is to descend to lower elevations immediately. Acclimatization by ascending to no more than 300 to 500 meters per day above your "acclimatization line", and the proper amount of rest and dehydrations are the best methods for prevention of AMS, So, gentle ascent is always pleasing to try to avoid acute mountain sickness. The trekking itineraries in this site are designed to ensure maximum enjoyment of trek and to minimize possible hazardous happening.

Some basic guidelines for the prevention of AMS:

  • Don´t fly or drive to high altitude.
  • Start from below 2500 meter and walk up.
  • Climb high and sleep low!
  • Increase your altitude by 300-500 meters per day only.
  • Stay properly hydrated and drinks enough water.
  • Urine output should be copious and clear to pale yellow.
  • Avoid tobacco, alcohol and other depressant drugs.
  • Eat a high calorie diet while at altitude.
  • If someone is sick in group, shouldn’t be left behind.
  • He/she needs help and care.
  • If symptoms are appearing, GO DOWN, DOWN, DOWN!

In conclusion, there is no need to worry about high altitude sickness for a perfect trekking but, light activity during the day is better than sleeping because respiration decreases during sleep, exacerbating the symptoms. Thanking you!

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