The pain in cluster is caused by certain small arteries in the scalp and one in the mouth (the arteries in the brain are not involved in cluster). For some unknown reason they dilate and the walls stretch and become painful. Migril is not a pain killer - its main ingredient is ergotamine. This helps because it reverses the painful dilatation of the arteries. To permanently eliminate the clusters these arteries can be closed permanently. It is a procedure carried out in a day clinic, and is about as traumatic as having the wisdom teeth removed. To listen to some of the patients who have had the procedure go to http://www.theheadacheclinic.net/tag/cluster-headache/
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