Gene Patterns of Chronic Migraine Headaches   Migraines Are Heritable Gene patterns in migraine headaches demonstrate strong association with sensitivity and susceptibility in families. Migraine headaches are known to cluster in families and have long been considered to be an inherited disorder. Migraine, with aura or without aura, has a substantial risk of familial occurrence, and genetic epidemiologic studies suggest that migraine without aura and migraine with aura have distinct and unique heritability. Twin studies reveal that approximately one half of the variation in migraine is attributable to additive genes, while the remainder is caused by unshared rather than shared...