When planning a trip to Tibet, many tourists are worried about the high altitude sickness very much. However in my experience of assisting clients' organizing tours to Tibet, I find there are very few people who get real problem with it. Most people can get used to the high altitude in the first one or two days in Lhasa. Here are some advices for your reference.

Mountain scenes are indeed breathtaking. As you reach higher altitudes, barometric pressure decreases so every breath you take contains fewer molecules of oxygen causing you to take more breaths to get the oxygen you need. Of course this happens when you exert yourself walking up any hill.

Unfortunately, the might of modern medical research can still not fully determine the causes of altitude sickness. However, it is thought in general that the drop in density from the oxygen at higher altitudes means that the body can not get the supply it needs and proceeds to let you know about it.

The obvious causes of altitude sickness, especially for people accustomed to living in lower altitudes, is the "thin air," or lack of oxygen at higher altitudes. The thin air causes the body to get less oxygen. To make up for this lack, the body compensates by increasing the heart rate and respiration, which helps to a certain extent, but not totally.

The higher we climb above sea level, the less oxygen the air contains. For people who usually operate below 5000 feet, their bodies aren't used to working in so little oxygen. People may begin to experience symptoms of altitude sickness, also known as Acute Mountain Sickness (AMS).

Reduced atmospheric pressure at higher elevations can cause your water molecules to virtually leap out of the body through respiration and sweating. Hydrate yourself with at least 6-7 liters of water daily. Whether you are thirsty or not, you need it.

The most common altitude-related disorder is acute mountain sickness, or AMS. The hallmark diagnostic feature of AMS is headache. AMS occurs in persons who have recently arrived at altitude greater than 8,000 feet suffering dull, throbbing headache, worse when bending down or straining to reach, and more intense at night and during the morning.

If a traveler refuse to visit to a doctor or just ignore it then he or she can experience high altitude pulmonary edema or high altitude cerebral edema. High altitude cerebral edema is a state where the brain swells and high altitude pulmonary edema is a state where fluid collects in the lungs. Both these situation are serious but curable.

People who enjoy high altitude sports like mountain climbing don't have the luxury of adjusting to thin air over time. Mountain climbing can be an exhilarating, inspiring experience. But not if you are dizzy, tired and achy because of the lower oxygen content in the air.

Of course if you do fall sick and need to exit the mountains then Nepal itself is a great place to be. Whilst Nepal is very spiritual (being the birthplace of Buddha) there are also a number of activities you can do. You could either catch one of the many festivals or take a flight over the mountains or enjoy a cycling trip.

High altitude Pulmonary Edema (HAPE) and High Altitude Cerebral Edema (HACE) are two different forms of Acute Mountain Sickness (AMS). As per studies AMS affects about 40 percent travelers at an altitude of up to 10,000 feet and more than 50 percent on routes on higher altitudes which are mostly taken by trekkers.

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