Altitude Sickness and Acclimatization are related with both necessary importance while trekking around a high altitude of the Himalayas range. Especially above 3,000 m or 9,842 feet high, where air pressure and oxygen level gets less facing into thin air. It entirely depends upon the grade and duration of trekking where altitude sickness and acclimatization involve.
All high altitude and acclimatization days include especially long and high trekking like on-base camps and crossing passes. Where trekkers need enough rest days and should be in good physical shape with sound health. As long trekkers take a slow, steady pace with enough rest can cope with high altitude sickness with ample acclimatization days.
Altitude Sickness is known as AMS in medical terms which means Acute Mountain Sickness, which occurs with mild to strong headaches. Includes other various symptoms like nausea, lack of appetite, sleepless nights, and suffocating from breathing problems. Altitude Sickness or AMS with two main symptoms HACE and HAPE.
HACE is High Altitude Cerebral Edema means water in the brain, whereas HAPE is High Altitude Pulmonary Edema means water in the lungs. When people with HACE or HAPE are considered a serious situation where the patient needs to be brought down at a safe height. In very bad condition needs to be evacuated by fastest means of transportation, like taking a helicopter service?
Annapurna region is one of the safest adventure destinations around the Himalayas altitude-wise, where elevation gains at a gradual pace. As the walk progresses trekkers will be well-acclimatized spending overnights at certain heights, as well as having acclimatization days where requires. Around the Annapurna region where altitude sickness might occur, where acclimatization days are required especially on the Annapurna circuit crossing the high Thorang-La pass. Which are 5,416 meters high to reach Mustang from Manang district, having acclimatization days at Manang 3,550 m high.
Everest region, trekker needs to be careful altitude wise walking around world highest region of all Himalaya range. Trek starts from 2,800 m at Lukla heading higher every day, having acclimatization days at Namche Bazaar at 3,440 m high. Whichever destinations are chosen around the Everest region, Namche Bazaar is the main spot for rest days for acclimatization before heading to higher ground.
Trekkers heading for Everest Base Camp, where few acclimatization days are required after Namche Bazaar will be at Dingboche or at Pheriche. The area falls on the route to Everest base camp at 3,400 m high, where a rest day is needed for proper acclimatization. On rest days taking a short hike to higher hills and then sleeping and resting at low altitudes supports acclimatization.
Langtang Region, another popular adventure destination after Annapurna and Everest, the closest mountain range located north of Kathmandu valley. High Altitude and Acclimatization depend on chosen destinations, as the Langtang region offers various exciting trekking and adventures. The popular trek of a week to Kyanjin Gompa around Langtang valley at 3,860 m / 12, 664 feet high. Where most trekkers spend extra days for acclimatization at Kyanjin Gompa, as well as heading towards high Gosainkunda Pond.
Manaslu Region falls within a restricted area, where trekkers need to obtain special permits to enter higher areas of Manaslu valley. On this trek where high altitude and pass involves, trekkers, get slowly get acclimatized as the walk progress to higher areas.
However, to make the trek more enjoyable trekkers spend an extra rest day for acclimatization at Sama-Gaon 3,525 m. As further adventure extends towards the high Larke-La Pass at 5,106 m and 16, 752 feet high, where trekkers need acclimatization.
Off the beaten tracks, involves treks around remote hidden corners away from the main trail and villages. Especially around the Far West or Far Eastern region of Makalu and Kanchenjunga base camp treks, including Lower / Upper Dolpo. Off the beaten tracks where tented camping is involved due to its remote and isolated location.
In these types of wilderness trekking on off-the-beaten tracks involve high altitude and passes. Crossing high over 5,000 m passes where trekkers need to take slow pace as well with enough acclimatization days.
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