All in your head? Substantial recovery rate with placebo effect in headache treatment, analysis finds

Headache is a very common complaint, with over 90% of all persons experiencing a headache at some time in their lives. In an analysis by Dutch researchers of 119 clinical trials, the "no treatment" and placebo groups had a high overall recovery rate of 36%. Control groups in pharmacological trials showed a higher response rate than the behavioral (non-pharmacological) trials (38.5% vs. 15.0%).

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