How does placebo effect work?

Related questions

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5. Is homeopathy really effective?
6. Is homeopathy banned in USA?
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Tags

1. #possible
2. #expects
3. #effects
4. #person
5. #caused
6. #placebo
7. #effect
8. #cause
9. #common
10. #something
11. #similar
12. #might
13. #expectations
14. #theories
15. #chemistry
16. #medication