Altitude sickness can develop at any altitude over than 2000 meters. The early symptoms are headache, extreme fatigue, and loss of appetite. Some people become breathless at rest. Altitude sickness is the result of fluid accumulating in parts of the body. Where it does not belong: in the brain, in the lungs, or both. When mild symptoms develop, it is a signal that you must stay at that altitude until symptoms have gone away. Never ascend with any symptoms of altitude sickness. Usually within one or two days you will feel well and can continue you trek.
If you are resting at the same altitude and your symptoms are becoming worse, then it is necessary to descent. Worsening symptoms of AMS include increasing tiredness, severe headache, vomiting, and loss of coordination. These are signs of High Altitude Cerebral Edema of HACE. HACE can lead to unconsciousness and death with 12 hours if progressive symptoms are ignored. Increasing shortness of breath, cough, and tiredness are signs of High Altitude Pulmonary Edema or HAPE. HAPE can also be rapidly fatal if ignored.
Following are some altitude sickness type:
• Cold Injury
• Slow Hypothermia
• Sudden Hypothermia
• Snow Blindness