The reason for hot flashes is actually quite simple. Dropping levels of estrogen and progesterone throws off a part of the brain that regulates your body temperature. The brain gets confused and misreads changes in your body temperature, thinking that a crisis is at hand. Typically it thinks that you are overheating. In order to avert the crisis the brain instigates emergency measures to cool you down. The end result is a hot flash followed by the sweats.
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