If you are experiencing a medical emergency please dial 911 immediately
In general, headaches have many causes, including tension or changes to blood vessels (vascular changes). But only a few other conditions have symptoms that are similar to cluster headaches, such as:
|Primary Medical Reviewer||Anne C. Poinier, MD - Internal Medicine|
|Specialist Medical Reviewer||Colin Chalk, MD, CM, FRCPC - Neurology|
|Last Revised||January 27, 2012|
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