222. SICK OF HEIGHTS The primary symptoms of altitude sickness are headache, loss of appetite, nausea, fatigue, light-headedness, difficulty in sleeping, confusion and staggering. To avoid them, ascend slowly over a prolonged period of time. Ascending beyond 8,000 feet should be done at a rate of no more than 1,500 feet per day. The best remedy is to descend to a lower elevation.