To get a permit you should submit the following documents and mention the following information to us. ...Details
Arrival in Lhasa from Chengdu ,Departure from Lhasa to Chengdu ...Details
Acute Mountain Sickness(AMS) is common at high altitudes, and depends on the elevation, the rate of ascent and individual susceptibility. Most visitors to Tibet will suffer from at least some symptoms that will generally disappear through acclimatization in several hours to several days. ...Details
Medicines: try to bring the following medicines which will be very useful during your travel. Cold and flu tablets, throat lozenges and nasal decongestant. ...Details
Northern Tibet: With the average altitude of 4,500m, this area offers very limited time for tourists. Summer (July to August) is the prime time to enjoy the great plain in northern Tibet. ...Details
Other documents are the same as you travel to other places of China - you need hold a valid passport with valid visa (issued by Chinese Embassy). If you are coming to Lhasa from Kathmandu, you'd better get China visa from Kathmandu because no matter you've already got the visa in your country or not, you must get a visa in Kathmandu, which is regulated in an official memo between China and Nepal.