Hot flashes are sudden feelings of warmth, which are usually most intense over the face, neck and chest. Your skin may redden, as if you’re blushing. Hot flashes can also cause profuse sweating and may leave you chilled. Although other hormonal conditions can cause them, hot flashes most commonly are due to menopause — the time when a woman’s menstrual periods stop. In fact, hot flashes are the most common symptom of the menopausal transition. How often hot flashes occur varies from woman to woman, but usually the range is from one or two a day to one an hour. There are a variety of treatments for particularly bothersome hot flashes.
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http://www.mayoclinic.org/diseases-conditions/hot-flashes/basics/definition/con-20034883