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.
By Mayo Clinic Staff. By definition, chronic daily headaches occur 15 days or more a month, for at least three months. True (primary) chronic daily headaches aren't caused by another condition. There are short-lasting and long-lasting chronic daily headaches. Long-lasting last more than four hours.