hot flashes are hot because the part of the brain that controls your body temperature (the hypothalamus) stops functioning properly, it could happen once, periodically or whenever due to various reasons from change in hormones, due to drugs, diet, exercise and any other number of reasons
there are various ways by which the body temperature is regulated and the most prominent in hot flashes, is increased blood flow in certain areas due to widening(dilatation) of blood vessels in that particular area, resulting in “flushing” or redness and warmth in those areas.
Hope it helps, feel free to ask any questions 🙂
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