what can cause hot then cold flashes
Due to estrogen levels decreasing, hormonal and biochemical imbalances occur, according to the 34 Menopause Symptoms website. The falling estrogen levels are thought to be the cause of both hot and cold flashes. The hypothalamus, the area of the brain responsible for body temperature regulation, becomes overactive. This causes the hypothalamus to release chemicals that cause blood vessels in the skin to expand in order for heat to be emitted.