Altitude Sickness is the effect of altitude on those who ascent too rapidly to elevations above 3,000 meters. The basic early symptoms of altitude sickness are headache, loss of appetite and sleeplessness. One shouldn't ignore these early symptoms as these symptoms may lead to more serious warnings and cause death sometimes within few hours. Medicine is no substitute for descent. If a doctor is available, he/she may give medicine and oxygen. However, the patient must go down to lower altitude even if treatment is given. In the event of a real emergency, the guide will do his best to get you transported quickly to a qualified physician or call us from the trek so that we can arrange a helicopter rescue service where you may be evacuated to Kathmandu.