Symptoms usually come on within 12 to 24 hours of reaching an elevation higher than 8,000 feet and then get better within a day or two as your body adjusts to the change in altitude. Usually worse at night, you might feel:
- Fatigue and loss of energy
- Shortness of breath
- Problems with sleep
- Loss of appetite
- Headache
- Dizziness
- Nausea
- Vomiting