Altitude sickness or mountain sickness is a physical condition that occurs due to a lower level of Oxygen and air pressure. There are three types of altitude sickness such as acute altitude sickness (AMS), high altitude pulmonary edema (HAPE) and high altitude cerebral edema. Some of the symptoms of altitude sickness are Headache, Fatigue, Insomnia, Shortness of breath, Fever, Nausea, Respiratory failure (extreme), Coma (extreme), And even death in some cases. It is advisable to tourists to have at least two days of acclimatization before moving to the higher altitude.