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).
Headache (Mild) Mild headaches are common but usually do not represent a serious illness. They result from irritation or injury to pain-sensing structures of the head. Symptoms of mild headache pain include aching, squeezing, or bandlike pain, on both sides of the head, generally above the level of the eyebrows. Treatment includes a variety of self-care measures and over-the-counter medications.