Altitude sickness is your greatest concern.
- mild symptoms are common: headache, loss of appetite, dizziness, difficulty sleeping
- severe symptoms: breathlessness, cough, lack of coordination, & worse
- most hikers get some symptoms above 2500m
- acclimatizing 2-3 days for each 1000m gain helps
- Huaraz is at 3090m
- Acute Mountain Sickness <details> can be fatal
- drug treatment is controversial <details>
- better is to immediately descend
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