The Everest Marathon is a high altitude race held in a region with low atmospheric pressure and oxygen levels, with some parts covered by snow all year round. Thus, to avoid health risks like altitude sickness, snow blindness and cold allergy, runners often require some days for acclimatization in the race. Usually, participants are advised by the event organizers to stay around the region for a few days or even hike towards the starting point from Lukla. Some agencies even prefer the participants spending up to 7 days for preparation of the trip.