placebo effect
pləˈsēbō əˈfekt,ēˈfekt/
noun
a beneficial effect, produced by a placebo drug or treatment, that cannot be attributed to the properties of the placebo itself, and must therefore be due to the patient's belief in that treatment.
(antonym: nocebo effect)

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Hi!
I'm Chrys, an amateur writer. 
I like mysteries, fantasies, and historical fiction.