To describe the natural history of a condition or disease. To describe the natural history of a condition or disease. To determine effectiveness or cost effectiveness of treatments/services and/or health care products. To measure or monitor safety and harm. To measure quality of care.
According to the NMSS, attacks or flare-ups of symptoms only qualify as exacerbations if: 1  they occur at least 30 days from an earlier flare-up. 2  symptoms last for 24 hours or longer.
Your particular type of migraine is the greatest indicator of how long your migraine will last. An optical migraine, or an aura, lasts up to an hour or two. Classic migraines, which are painful migraines with an aura coming before the headache, last between one and two days. Common migraines, which do not have auras first, can last up to three or four days. Learn more about your type of migraine to determine about how long it will last.