A migraine is a severe, often debilitating headache marked by intense, throbbing pain, typically on one side of the head. It can be accompanied by symptoms like nausea, vomiting, and sensitivity to light or sound. Migraines may also include visual disturbances, such as seeing flashes of light or blind spots, known as an aura. The exact cause is unclear, but it is believed to involve abnormal brain activity. Migraines can be triggered by stress, certain foods, or hormonal changes and are managed with medication and lifestyle changes.