According to conventional medical wisdom, menopause-related hot flashes fade away after six to 24 months. Not so, says a new study of women going through menopause. Hot flashes and related night sweats last, on average, for about seven years and may go on for 11 years or more. The new estimates of the duration of these symptoms come from the Study of Women’s Health Across the Nation (SWAN), a long-term study of women of different races and ethnicities who are in the menopausal transition. The “reality check” the SWAN study provides on hot flashes should encourage women to talk with a doctor about treatment options. These range from estrogen-based hormone therapy to other medications and self-help measures.