Migraines are intense headaches often accompanied by other symptoms such as nausea, vomiting, and sensitivity to light and sound. They can last from a few hours to several days and may occur with or without an aura, which is a warning sign that can include visual disturbances or tingling sensations. The exact cause of migraines is not fully understood, but they are believed to involve changes in brain activity and blood flow. Triggers can vary widely and may include stress, certain foods, hormonal changes, and environmental factors. Treatment options include medications and lifestyle changes to help manage symptoms.