When should you worry about altitude sickness?

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Tags

1. #appetite
2. #other
3. #merck
4. #guides
5. #condition
6. #mostly
7. #acclimatization
8. #symptoms
9. #after
10. #sleep
11. #subsides
12. #fatigue
13. #manual
14. #sickness
15. #elevations
16. #acute
17. #headache
18. #restless
19. #effects
20. #mountain