Migraine headaches occur in both children and adults. They affect more women than men and are thought to be inherited as an autosomal dominant trait. There are five classifications of migraine but most are either migraine without aura (85%) or migraine with aura. Migraine without aura is a pulsatile, throbbing, unilateral headache that typically lasts one to two days and is aggravated by physical activity. Nausea, vomiting, and sensitivity to light and sound usually accompany the headache. Migraine with aura has similar but often more intense clinical features such as flickering lights, spots or lines or a reversible loss of vision. Feeling pins and needles or numbness, reversible speech disturbances or other neurological symptoms.