A. Altitude sickness often known as acute mountain sickness (A.M.S.) in general may occur when people ascend too quickly normally in altitudes of over 3000 m. We ensure minimal risk by building in rest days into our trekking Itinerary. Most people will feel some affect of altitude, shortness of breath and possibly light headed, this is fairly common. Acute mountain sickness is very different and normally involves a severe headache, sickness and loss of awareness. In almost every potential case there are enough warning signs to take appropriate action. Descending to a lower altitude will generally be enough to prevent any further problems. Some trekkers obtain a prescription for medication for AMS (Diamox) – you can discuss with your doctor whether this is right for you.