At what height does altitude sickness start?

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Tags

1. #possible
2. #arises
3. #though
4. #trigger
5. #altitude
6. #after
7. #intermediate
8. #unlikely
9. #acute
10. #least
11. #greater
12. #hours
13. #headache
14. #above
15. #metres
16. #ascending
17. #spent
18. #illness
19. #symptoms
20. #sickness
21. #level
22. #including
23. #range
24. #vomiting
25. #heights