(HealthDay News) — More than half of women experience menopause-related hot flashes and night sweats for seven years or more, according to research published online February 16 in JAMA Internal Medicine.

Nancy Avis, PhD, a professor of social sciences and health policy at the Wake Forest School of Medicine in Winston-Salem, NC, and colleagues collected data on 1,449 women who took part in the Study of Women’s Health Across the Nation from February 1996 through April 2013. All reported having frequent hot flashes and night sweats for at least six days in the past two weeks.

The researchers found that, on average, these symptoms lasted for 7.4 years, but in general the earlier symptoms started, the longer they continued. Those who had hot flashes and other menopausal symptoms before the transition to menopause suffered longest – 11.8 years was the midpoint for that group. And women who underwent early menopause suffered symptoms for roughly 9.4 years. Women whose hot flashes and night sweats started after menopause reported symptoms for 3.4 years on average.

Race and ethnicity seemed to have some bearing on symptom duration. Black women reported the longest duration of symptoms – 10.1 years. Japanese and Chinese women suffered the shortest length of time – 4.8 and 5.4 years, respectively. Among white women, 6.5 years was the midpoint, and among Hispanic women, it was 8.9 years. “Women should not be surprised if their hot flashes last a number of years,” Avis told HealthDay.

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