Why are placebos so effective?

Related questions

1. Can placebo cure cancer?
2. What causes placebo effect?
3. What is the purpose of a placebo?
4. Is it ethical to use placebo in clinical trial?
5. Can a placebo work if you know?
6. Is Ibuprofen a painkiller?
7. What is the point of placebo?
8. Do placebos work if you know?
9. Does ibuprofen make you sleepy?
10. Why are placebos unethical?

Tags

1. #produced
2. #studies
3. #where
4. #looking
5. #doesn
6. #think
7. #because
8. #effect
9. #often
10. #shrinks
11. #whether
12. #people
13. #placebo
14. #doctors
15. #placebos
16. #tumor
17. #little