Hot flashes occur sporadically and often start several years before other signs of menopause. They gradually decline in frequency and intensity as you age. Eighty percent of all women with hot flashes have them for 2 years or less, while a small percentage have them for more than 5 years. Hot flashes can happen at any time. They can be as mild as a light blush, or severe enough to wake you from a deep sleep.
Some women even develop insomnia.
Others have experienced that caffeine, alcohol, hot drinks, spicy foods, and stressful or frightening events can sometimes trigger a hot flash. However, avoiding these triggers will not necessarily prevent all episodes. Hot flashes appear to be a direct result of decreasing estrogen levels. In response to falling estrogen levels, your glands release higher amounts of other hormones that affect the brain's thermostat, causing body temperatures to fluctuate. Hormone therapy relieves the discomfort of hot flashes in most cases.