| A ClusterHead's Life: Weblog by a Canadian sufferer. |
| Cluster Headache: Concise listing of clinical features and management. |
| Cluster Headache: Consumer health resource center providing information on the causes, symptoms, and treatment. From eMedicine Health. |
| Cluster Headache FAQ: Frequently Asked Questions from the Michigan Head Pain And Neurological Institute. |
| Cluster Headaches: Further research into the possible elimination of chronic, severe and life altering headache pain, cluster headaches, through the use of hallucinogenic substances, which have proven to be more effective and less destructive to the human body, than traditional treatments. |
| Cluster Headaches Worldwide Support Group: Includes forum and cat room; medical articles and FAQs. |
| eMedicine Health - Cluster Headache FAQs: Consumer health resource with FAQs relating to these headaches characterized by short-lived attacks of sudden, severe pain around one of the eyes. |
| Organization for Understanding Cluster Headaches: Information about OUCH and its activities. Includes a quiz, medical information, comparison table and the International Headache Society diagnostic criteria. |
| OUCH (UK): Charity and expert patient group dedicated to helping cluster headache sufferers in the UK. Find support and membership details. |
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