Migraine is caused mainly by the contraction of the muscles around the neck, shoulders tense, until a small cube. 0.5-1.0 cm The blood and oxygen to the brain can not spot it. As a result, blood and oxygen can not be fully passed on to the head. You can not send blood to the head, the two sides are not equal. So it cause usually periodical and confined to one side of the head; now more commonly called Migraine