A migraine is a type of headache that is characterized by severe pain felt on one or both sides of the head. The pain is felt mostly in the front of the head, around the temples, or behind one eye or ear. The exact causes of migraines are unknown, but some common migraine triggers include stress, lack of sleep, and certain foods. Treatment options can include lifestyle changes, medications, and alternative therapies, such as biofeedback or acupuncture.