The trials showing a significant benefit of acupuncture were of dubious methodological quality. Overall, the trials were of poor methodological quality.
Recurrent headaches are a major source of morbidity and represent a significant economic burden.
Acupuncture is widely used for the treatment of headache. Reviewers conducted comprehensive searches including the main databases and references of retrieved reports. A second methodological quality scoring method was also used, the Internal Validity Scale, maximum score six. Additional information was sought from trial authors but only yielded further data on one trial. Reviewers provide a descriptive summary of all included reports and a vote count of clinical outcome.