Researchers in the latest issue of Harvard Women's Health Watch had explored the physiology of hot flashes experienced by some women in their menopausal or postmenopausal age.
Hot flashes are well known to most menopausal women—and to many who are in peri-menopause, the transition to menopause. Hot flashes tend to come on suddenly and last from one to five minutes; they can range in severity from fleeting warmth to a feeling of being on fire.
Although the physiology of hot flashes has been studied for more than 30 years, no one is completely sure why or how they occur. One possible explanation has to do with an individual's tolerance for temperature changes. One line of research shows that women who have hot flashes have a lower tolerance for changes in the body's core (innermost) temperature than women who don't have hot flashes.
Normally, the body tries to maintain its core temperature within a comfortable "thermoneutral zone." When core body temperature crosses the upper threshold of this zone, sweating occurs; when it drops below the lower threshold, shivering results.
Women who have hot flashes have a thermoneutral zone that's so narrow, even the tiniest changes in core body temperature can trigger sweating (or chills). These symptoms are generally absent in women with a wider thermoneutral zone, explains the Harvard Women's Health Watch.
The authors also discussed why the thermoneutral zone is narrower in women with hot flashes and strategies for managing symptoms, including hormone therapy, medications that affect brain chemicals, and a method of breathing called paced respiration.
Medindia on Menopause:
This is the condition of reproductive ageing for women. It begins at around the age of 40 years when the menstrual periods become irregular. Hormones levels of estrogen and progesterone declines and this may cause a variety of health problems like hot flashes, vaginal dryness, and end of having menstruation periods.