Heart rate and skin blood flow increase, although internal body temperature may drop by as much as three or four degrees as the body struggles to correct the imbalance. After the flash, the body quickly becomes chilled as it struggles to regain its normal temperature. Some flashes can last 15 to 30 seconds, while others from 3 to 6 minutes. Most women who've come through Power Surge have described theirs as approximately 5 minutes, but they can last as long as 30 minutes to even an hour. They can hit as often as every 90 minutes.
Hot flashes are more common in the evening and during hot weather.
Seventy-five to 80 percent of women going through menopause experience hot flashes. Some are more bothered by them than others. Hot flashes may last two to three minutes or up to 30 minutes. They can occur once a week, maybe never. Hot flashes may happen once or twice, or continue for up to ten years.