or suspected low Mg levels). Epidemiology These headaches are estimated to appear in roughly 1% of the population. They can occur with sexual activity at any age. It is more common in men than women, with studies putting the gender ratio between 1.2:1 and 3:1. See also Postorgasmic illness syndrome (POIS) Intracerebral hemorrhage Thunderclap headache References External links Medscape: Etiology of Coital Headaches Headaches Sexual health