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Cluster headaches

From SNPedia

Cluster headaches are severe, frequent headaches occuring almost every day or even multiple times per day, with each attack lasting 15 minutes up to 3 hours, and also associated with at least 1 of 8 local autonomic signs. Most patients have the episodic subtype, in which the headaches occur in clusters during a period lasting from a week to a year though separated by attack-free intervals of 1 month or more. Wikipedia

SNPs linked to cluster headaches include: