Migraine is a neurological, genetic disease that has a complex group of symptoms, including head pain, light and sound sensitivity, nausea, and trouble concentrating. Migraine affects about a billion people worldwide — including one in five women. Though it’s a common condition, its symptoms are often underrecognized. While many are familiar with migraine as a type of headache, a migraine attack actually has four stages: prodrome, aura, headache and postdrome.To help evaluate whether recurrent headache attacks could be migraine, Halker Singh recommends using the mnemonic “PIN.”P: Photophobia, the medical term for light sensitivityI: Impairment, meaning you don’t feel like you’re operating on your normal cognitive levelN: NauseaIf recurrent headaches are accompanied by two out of the three symptoms outlined by “PIN,” there is a good chance that you’re experiencing migraine headaches — as opposed to other types of headache, like tension headaches or sinus headaches.