Altitude sickness in Cusco: what helps and how to plan your first days
Updated October 24, 2026 · 5 min read
Cusco sits at about 3,350 metres, high enough for an unacclimatised visitor to develop altitude illness. Fitness does not protect you, and a comfortable previous trip does not guarantee the next one. The useful plan is not a miracle remedy but a slower first 48 hours and a willingness to change the itinerary.
Make the first days lighter
The CDC’s high-altitude guidance recommends gradual ascent and only mild exercise during the first 48 hours. If your route allows it, sleeping lower in the Sacred Valley before Cusco reduces the abrupt jump. On arrival, choose an easy central walk rather than Rainbow Mountain, Humantay Lake or a hard trek.
Eat normally, drink according to thirst and avoid alcohol at first. Water prevents dehydration, but drinking excessive amounts does not cure altitude illness. Coca tea may be culturally familiar and comforting, yet it is not a substitute for acclimatisation or medical care.
Recognise symptoms and red flags
Acute mountain sickness commonly brings headache with nausea, dizziness, unusual fatigue or poor appetite, often after the first night. Do not go higher while symptoms remain. If they worsen at the same altitude, descend and seek medical help.
Confusion, loss of coordination, severe breathlessness at rest, marked weakness or cough can signal life-threatening high-altitude illness. Descend urgently and obtain emergency care. A small oxygen canister or a tour operator carrying oxygen is not permission to continue climbing.
Medication needs individual advice
Acetazolamide can help prevention or acclimatisation in appropriate travellers, but it has contraindications and is not a universal travel accessory. Discuss it with a clinician who knows your medical history before departure. People with heart or lung disease, pregnancy or other relevant conditions should seek personalised advice before a high-altitude itinerary.
A gentle walking tour in Cusco can fit the first day if you feel well, but keep plans cancellable. Acclimatisation improves comfort; it cannot make a rushed climb risk-free.
