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In the last decade, migraine headaches have become a common health complaint. A review in 2013 indicated that anywhere between 16.2% to 22.7% of adults over the age of 18 complained of episodic or chronic migraines. The occurrence was higher in females than in males, and specifically in women of reproductive age. A large amount of data on the rates of migraine occurrence, treatment, predisposing factors, comorbidities, and prevention has been collected and analyzed by the American Migraine Prevalence and Prevention (AMPP) study; this is an ongoing study that is continuing to collect and report such data on migraine epidemiology.