To put it easily there will be improvement in ur medical condition b/c you thought they gave u a drug b/t they didn't can be simply vitamin or water injection

PLACEBO COMES FROM the Latin for “I shall please.” The term was used in the fourteenth century to refer to sham mourners who were hired to wail and sob for the deceased at funerals. Placebos run on the power of suggestion. They are effective because people believe in them. You see your doctor and you feel better. You pop a pill and you feel better. And if your doctor is a highly acclaimed specialist, or your prescription is for a new wonder drug of some kind, you feel even better.