Menopause is the time in your life when you naturally stop having menstrual periods. Menopause happens when the ovaries stop making estrogen. Estrogen is a hormone that helps control the menstrual cycle. Menopause marks the end of the reproductive years. The average age that women go through menopause is 51 years. The years leading up to menopause are called perimenopause. Beginning in your 30s and 40s, the amount of estrogen produced by the ovaries begins to fluctuate. A common sign of perimenopause in women is a change in the menstrual cycle. Cycles may become longer than usual for you or become shorter. You may begin to skip periods. The amount of flow may become lighter or heavier. Although changes in menstrual bleeding are normal during perimenopause, women should still report them to a menopause specialist. Abnormal bleeding may be a sign of a health problem. Some women do not have any symptoms of perimenopause or have only a few mild symptoms. Others have many symptoms that can be severe. Common signs and symptoms include the following: Hot flashes—A hot flash is a sudden feeling of heat that rushes to the upper body and face. A hot flash may last from a few seconds to several minutes or longer. Some women have hot flashes a few times a month. Others have them several times a day. Hot flashes that happen at night (night sweats) may wake you up and cause you to feel tired and sluggish during the day. Sleep problems—You may have insomnia (trouble falling asleep), or you may wake up long before your usual time. Night sweats may disrupt your sleep. Vaginal and urinary tract changes—As estrogen levels decrease, the lining of the vagina may become thinner, dryer, and less elastic. Vaginal dryness may cause pain during sex. Vaginal infections also may occur more often. The urethra can become dry, inflamed, or irritated. This can cause more frequent urination and increase the risk of urinary tract infections. More info