Most migraines cause a headache and nausea and might make the person dizzy or very sensitive to bright lights or loud noises. Some people have "auras" before a migraine starts, which means their ability to see becomes different. They may see funny patterns, have blurry vision, or may not be able to see at all. Other senses can change before or during a migraine, and the person may sense funny smells or tastes. Migraines can last a long time. Migraines usually last between four and 72 hours.