Causes and Mechanism
Research on hot flashes is mostly focused on treatment options. The exact etiology and pathogenesis, or causes of vasomotor symptoms (VMS)- the clinical name for hot flashes - has not yet been fully studied. There is empirical knowledge that hints at reduced levels of estrogen as the primary cause of hot flashes. There are indications that hot flashes may be due to a change in the hypothalamus's control of temperature regulation. This would mean that the sensation of heat isn't merely imaginary, but due to actual changes in body core temperature.
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“A mechanism of some kind stands between us and almost every act of our lives.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 3, ch. 2 (1962)