what is a migraine headaches
Migraine is a neurological disease characterized by recurrent moderate to severe headaches often in association with a number of autonomic nervous system symptoms. The word is derived from the Greek á¼¡Î¼Î¹ÎºÏÎ±Î½Î¯Î± (hemikrania), pain on one side of the head, from á¼¡Î¼Î¹- (hemi-), half, and ÎºÏÎ±Î½Î¯Î¿Î½ (kranion), skull. Chronic migraine is a complication of migraines, and is a headache that fulfills diagnostic criteria for migraine headache and occurs for a greater time interval. 2  Specifically, greater or equal to 15 days/month for longer than 3 months.