The Everest Nagpa La trek is designed in such a way as to allow full acclimatization to prevent anyone from getting AMS (Acute Mountain Sickness). When trekking in the high altitude, the general rule is to keep a slow pace allowing the body enough time to adjust to the height gained every day. The higher the altitude, the less is the oxygen in the air and our body needs to adjust to this accordingly.  It is therefore essential that we allow you sufficient time for acclimatization.  Since this trek gains a maximum height of 5710m  it is important that we keep our pace slow and steady at least for the initial walking days. And in order to avoid the likelihood of being affected by altitude sickness, we have planned our itinerary by keeping the initial days of walking moderately within limits and by providing plenty of time for proper acclimatization. Further we have a two full rest days at Namche and Gokyo before proceeding ahead to the higher altitude, besides the short hikes in and around other places. Still, if you are concerned about it in anyway please refer to “Altitude illness” by Dr. Jim Duff” (http://www.treksafe.com.au/medical/altitude_illness.htm) who has provided detailed information about altitude sickness and the ways to prevent them.

Preventing altitude sickness when trekking in Nepal:

•Ascend slowly to altitudes above 2500m.
•Take 48 hours to acclimatize when ascending above 2500m. 
•Avoid alcohol or sleeping pills
•Drink plenty of water or herbal tea (no alcohol or coffee)
•The altitude at which you sleep should be no higher than 300m than your sleeping altitude of the previous night