head trauma is a common attack precipitant, so fhm sufferers should avoid contact sports. acetazolamide or standard drugs are often used to treat attacks, though those leading to vasoconstriction should be avoided due to the risk of stroke. epidemiology migraine itself is a very common disorder, occurring in 15–20% of the population. hemiplegic migraine, be it familial or spontaneous, is less prevalent, at 0.01% prevalence according to one report. women are three times more likely to be affected than males.