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.
Most people with multiple sclerosis (MS) have a type called relapsing-remitting MS (RRMS). It usually starts in your 20s or 30s. If you have RRMS, you may have attacks when your symptoms flare up. These are called relapses.