Each year, about 25 million people in the U.S. experience migraine headaches, and about 75% are women. Migraines are intense and throbbing headaches that are often associated with nausea and sensitivity to light or noise. They can last from as little as a few hours to as long as a few days. Many of those who suffer from migraines experience visual symptoms called an "aura" just prior to an attack that is often described as seeing flashing lights or that everything takes on a dream-like appearance.  Although headaches can be due to a wide variety of causes, such as drug reactions, temporomandibular joint dysfunction (TMJ), tightness in the neck muscles, low blood sugar, high blood pressure, stress and fatigue, the majority of recurrent headaches are of two types: tension headaches (also called cervicogenic headaches) and migraine headaches.