give reason why we feel nausea and fatigue when we reach a high altitude such as Rohtang pass and then, gradually we feel normal.
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Altitude sickness can occur when traveling to an altitude above 6,000 feet (1,829 meters) and traveling faster than the body can adapt.
Are you traveling to a high altitude destination? Here are altitudes of some common destinations:
Cuzco, Peru = 11,203 feet (3395 meters)
Quito, Ecuador = 9,252 feet (2820 meters)
Lhasa, Tibet = 13,000 feet (3965 meters)
OR you can Google your destination and altitude now.
Although people can adjust to altitude changes, the process takes time. Travel by plane, car or bus and even hiking may not give you enough time to adjust, and you may develop altitude sickness.
Altitude sickness develops during or after ascent (going up). Fluid leakage from blood vessels seems to be the main cause of symptoms.