Everest Base Camp Trek, Ebc, Everest Trekking.
3000 m. Some trekkers may even suffer below the altitude of 3000 m too. Everest Base Camp Trek is at an altitude of 5364 m and Kala Patthar is at 5644.5 m. Altitude sickness symptoms are headache, hangover, nausea, fatigue, breathlessness, loss of appetite/sleep, and in extreme cases