Altitude Sickness also known as Acute Mountain Sickness (AMS) is caused as the body fails to adjust to reduced availability of oxygen at higher altitude. With the increase in altitude and decrease in pressure, the amount of oxygen of our lungs and body absorb with every breath reduces.

The main factors which affect Altitude Sickness are – a quick ascent, overexertion of the body and dehydration.

However, if you give your body proper acclimatization during your ascent and remain hydrated then your body can adapt to the low-level oxygen in your body. Also if you feel any symptoms of altitude sickness then it is best to descend to a lower elevation and rest before continuing your journey.

In some rare cases the lower pressure at high altitudes can make fluid leak from the vessels into the lungs and cerebrum. This can prompt life undermining conditions know as High Altitude Pulmonary Edema (HAPE) and High Altitude Cerebral Edema (HACE). If any side effects of HAPE or HACE show up in a climber they should be evacuated immediately as it can be life-threatening.