A migraine is a common neurological disease that causes a variety of symptoms, most notably a pulsing headache on one side of your head and that cause extreme pain. Your migraine will likely get worse with physical activities, lights, sounds or smells. It may last at least three to four hours or even days. 

 In simple words..migrane is a medical condition which usually causes a pounding,  headache on one side of the head. The pain may be bad and hurt a person may have a hard time doing anything.