Mountain Sickness Topic Guide
Altitude Sickness (Mountain Sickness): Altitude sickness (mountain sickness) is caused when a person's body is not able to adjust to a higher altitude. Acute altitude sickness symptoms fatigue, headache, dizziness, insomnia, nausea, decreased appetite, edema, and social withdrawal. Most cases of altitude sickness are resolved by going to a lower altitude. Altitude sickness can be severe and life-threatening if it progresses to high altitude pulmonary edema (HAPE).
Edema Edema, or the abnormal accumulation of fluid in tissues in the body can be caused by several factors. Treatment of edema depends on the cause of the edema.