Even young children may have migraine headaches. Migraine can produce different symptoms in different people. However, most migraines are similar in that the pain is not usually continuous, is often more severe on one side of the head, is often accompanied by nausea and vomiting, and is not often associated with serious complications. Migraine may occur with a sudden increase or decrease in stress level. For example, a person entertaining an unwelcome guest, or a hardworking executive who begins an overdue vacation, may experience a migraine.
Headaches caused by diseases are the least common cause of headache.
Headaches caused by eye disease are usually felt in the eye or in the brow on the side where the disease occurs. These headaches are often associated with some other symptoms, such as blurred vision, halos around lights, and extreme sensitivity to light. Headaches may also be caused by high blood pressure. A blood pressure measurement is helpful in evaluating any lasting or recurring headache. However, there are many people with high blood pressure who do not have headaches.