peapöörituse, iivelduse, hingeldamise, südamepekslemise, isutuse jm. tunnustega seisund, mis tekib tervel inimesel üle 3 m kõrgusel mägedes või lahtises lennukis
hapnikuvaegusest tingitud haiguslik seisund, mis tekib kõrgmägedes
altitude sickness that is experienced usually within several hours to one day of ascending above 8000 to 10,000 feet (about 2500 to 3000 meters) and that is marked by headache, nausea, loss of appetite, vomiting, insomnia, dizziness, and fatigue, and may lead to serious complications including severe edema of the brain or lungs
There are three major clinical syndromes that fall under the heading of altitude sickness: acute mountain sickness (AMS), high-altitude pulmonary edema (HAPE), and high-altitude cerebral edema (HACE). These syndromes are not separate, individual syndromes as much as they are a continuum of severity, all resulting from a decrease in oxygen in the air. AMS is the mildest, and the other two represent severe, life-threatening forms of altitude sickness.