Everybody knows that the most important thing of traveling to Tibet is high altitude sickness. It is a problem but it is not awful. You should know your personal physics before Tibet tour starts and it will help you to have a better psychology for preventing high altitude sickness.
Caused with the lack of oxygen at the higher location, the symbols of high altitude sickness appears. In general, high altitude sickness may be caused at the height of 700 meters. The symbols of high altitude sickness is headache, breathe hard, chest distress, anorexia, fever, dizziness and weak, etc.
The most important thing to prevent and avoid high altitude sickness is keeping a good psychology before Tibet tour starts. Do not fear of high altitude sickness as it is an individual problem. You may not cause it. Most of tourists have the slight symbols of high altitude sickness and they feel much better at the second day of arrival in Lhasa.
Rhodiola rosea, American ginseng tablet, glucose liquid, and Bufferin, etc.
People who have terrible heart disease and respiratory system disease, etc are not suggested to travel to Tibet. People who get a cold before Tibet tour starts are not suggested to visit Tibet soon, either.