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.
On average, a cluster. period lasts 6 to 12 weeks while remissions can last up to 12 months or longer. The episodic form is the most common, affecting 80 to 90 percent of patients with cluster. headache. It is characterized by periods of attacks (clusters or bouts) and periods of remission. In a bout, patients may experience one to eight attacks per day, and bouts may last from. seven days to 12 months [1].