Hot flashes are a signature symptom of menopause, but for some women, they last far longer than expected—sometimes up to 15 years. What causes them, and why do they vary so much from person to person?

Hot flashes are feelings of intense heat that often affect women during menopause. But men can also experience hot flashes from hormonal changes, lifestyle causes, and some medical conditions.

Hot flashes are a huge factor for women when they ... that's where you feel a lot of your heat to again maintain sort of a constant temperature. But if your hormones go kooky, you're going to ...