early 15c., from Middle French lesion, from Latin laesionem (nominative laesio) injury, from past participle stem of laedere to strike, hurt, damage, of unknown origin. Originally with reference to any sort of hurt, whether physical or not.
Most migraines last about 4 hours, but severe ones can last up to a week. How often they happen differs for everyone, but itâs common to get two to four headaches per month. Some people may get migraines every few days, while others get them once or twice a year.
Most people have episodic migrainesâwith intervals of various lengths between attacks. But, about 3 percent of the US population has CHRONIC migraine, which is technically defined as having at least 15 days of headache each month for at least 3 months.