Bhutan is tucked between India and China with the average elevation of 8000 meter above sea level. The northern part of the country is dominated by the Himalaya Mountains of Bhutan where peaks can easily reach 7,000 meters (22,966ft). Gangkhar Puensum located at an altitude of 7570m (24836 ft.) is the highest point in Bhutan. Bhutan experience extreme weather in the mountains: the high peaks have perpetual snow, and the lesser mountains and hewn gorges have high winds all year round, making them barren brown wind tunnels in summer, and frozen wastelands in winter. Drangme Chhu located at an elevation of 97 m (328ft) above sea level is the lowest point of the Bhutan. The inner Himalayas range resides at an altitude of 2250m. The greater Himalayas are measured in the range of 2250m to 4500m.
High Altitude Sickness is common in Bhutan while trekking at higher altitude being a mountainous country. You are highly recommended to acclimatize yourself before starting trekking in the higher region and also suggest you to trek slowly and comfortably as trekking in the higher altitude to fast might cause serious health problem enough to cause death. As higher the altitude you go the lower the oxygen you get so plan your itinerary in such a way that you could easily adapt the fluctuation of oxygen. The person with heart, blood or respiratory disease is highly recommended to consult their medical professional before travelling. The High Altitude Sickness results in mild headaches, fever, loss of appetite or stomach disorder.