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The '''placebo effect''' is the well-known lessening of pain and other symptoms when a patient is given an inert substance instead of told that he is getting normal medicine.<ref>a tendency Scientists generally agree that for a beneficial the placebo effect to occur if a person is expecting , the subject must believe that a he is given effective treatment will and that it must be therapeuticsuggested to him that the treatment is effective. The question of how and why placebo responses are generated is still a matter of debate. [http://www.socyberty.com/Psychology/The-Power-of-the-Placebo-Effect.71494 The Power of the Placebo Effect]</ref> but actually given an [[inert substance]],<ref>A placebo is a neutral treatment (such as an inactive pill) that may nevertheless promote healing because of the hope and confidence placed in it. [http://www.cox-associates.co.uk/glossary/technical.phpCox Associates] - glossary of psychological terms</ref> such as sugar pills.It can occur when exploratory surgery is conducted, too. For example, a tension headache will frequently disappear if the patient believes they are being given an analgesic.<ref>Cephalalgia Volume 23 Issue 1 [http://www3.interscience.wiley.com/journal/118883656/abstract?CRETRY=1&SRETRY=0Cephalalgia Volume 23 Issue 1]</ref> Researchers generally believe that its effect is due entirely to the patient's [[expectation]].

A '''placebo''' The effectiveness of a pain relief medicine is a [[substance]] or [[treatment]] used as a decoy in studies for always contrasted with the "control" part effectiveness of the samplea placebo. The question is not how well it relieves pain, but how much better is it than a placebo?Part of the study group will receive a placebo, and the remainder the group will receive the new [[medication]] being studied, so that the differences in outcome may be compared.  It is well known to medical researchers that merely assuring someone that a treatment will be successful, greatly increases the chance of the treatment actually working.{{fact}} This is known as the placebo effect. Its  The effectiveness of a pain relief medicine is always contrasted with the effectiveness of a placebo. The question is not how well it relieves pain, but how much better is it than a placebo?

*Two hours after treatment of an in-progress moderate or severe headache, 49% of patients given 100 &nbsp;mg of sumatriptan reported no or mild pain, a significantly greater response rate than the 38% among the placebo group. At 4 hours, the response rate was 64% with sumatriptan and 45% with placebo.<ref>Jancin, Bruce. [http://findarticles.com/p/articles/mi_hb4345/is_/ai_n29117915"For tension headache, 100 mg of sumatriptan far exceeds placebo".]Clinical Psychiatry News. August, 2004. via FindArticles.com</ref>