Hot flashes, also known as flushes, are the most common symptom of menopause. The cause of the hot flashes is similar to a withdrawal syndrome; your brain becomes very adapted to estrogen after puberty, and the decline in estrogen associated with hormonal aging can cause a chain reaction in the brain leading to hot flashes.
Estrogen primarily comes from mature ovulating eggs and declines across your lifetime due to the steady decline in these eggs. The result is an increase in your brain’s attempt to stimulate the ovary to remain fertile, which is a fruitless effort as Mother Nature has designed the decline in the first place. A woman’s brain continues to try and prompt ovulation, and this is often accompanied by withdrawal symptoms such as surges of adrenalin, a phenomenon also seen with substance addiction. Withdrawal from estrogen can cause hot flashes, sweats, heart palpitations, insomnia, anxiety, and other symptoms due to surges in adrenaline-like chemicals.
The good news is that most women experience hot flashes only temporarily. The bad news is there is no medical test to determine how long they will last. Data shows that the range for most women is between 6 months to 3 years, but for some, the flashes never stop.