All Nepal Adventure Tours & Treks

GOVT REGD NO: 114523/070/071

Quick Questions? Email Us

Talk to an Expert

+977 9851046453


Every year, at least three trekkers suffer from AMS. High altitude sickness, often known as altitude sickness, is the most serious medical risk while trekking in Nepal's high Himalayas. The effect of altitude on people who ascend quickly to elevations exceeding 2500 meters is known as high altitude sickness (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 a 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 bodies have the ability to adjust to higher altitudes if given enough time. This process of adaption is called acclimatization. Altitude illness occurs as a result of a 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 in the lungs, you become breathless more easily while walking. A cough begins dry and irritative, but progresses 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 into the brain, you initially develop a headache, loss of appetite, nausea, and vomiting. This symptom is referred to as acute mountain sickness (AMS). If you become more tired, you like to lie down and do nothing, as you lose coordination and eventually sleep in a 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. 

These 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.
  • A general feeling of malaise
  • These symptoms must be taken very seriously. In case of the appearance of any of the above mentioned symptoms, any further ascent should be avoided, otherwise more serious, even life-threatening problems 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 dehydration are the best methods for prevention of AMS, So, a gentle ascent is always pleasing to try to avoid acute mountain sickness. The trekking itineraries on this site are designed to ensure maximum enjoyment of the trek and to minimize possible hazards.

Some basic guidelines for the prevention of AMS:

  • Don't fly or drive to high altitude.
  • Start from below 2500 meters and walk up.
  • Climb high and sleep low!
  • Increase your altitude by 300-500 meters per day only.
  • Stay properly hydrated and drink 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 a group, they 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 trek, but light activity during the day is better than sleeping because respiration decreases during sleep, exacerbating the symptoms. Thank you!

Certificate & Partners


Copyright 2024 © by All Nepal Adventure Tours & Treks P. Ltd.