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.
Hot flashes, also known as hot flushes, are a common symptom of perimenopause. One study found that moderate to severe hot flashes could continue past perimenopause and may last for a median of 10.2 years. But some researchers say that exceeds the generally accepted timeframe.