Cluster headache: a review of online resources for patients and clinicians.

Technology has revolutionized the ability of both patients and physicians to find and retrieve medical information. In particular, the Internet has become an increasingly important source of information for patients and physicians in all medical fields, including headache. Although these resources may be readily available, it is not certain that those who would benefit most from these websites are aware of their existence or how to differentiate if the website is reputable. This article briefly reviews how patients and physicians can differentiate which sites provide legitimate and reputable information and then focuses on where to find online information on cluster headache.