What doctors officially call menopause is an event - namely, the point at which you get your last menstrual period. This permanent cessation of menstruation is usually marked by 12 consecutive months of having no periods. Most women experience menopause from 40 to 58 years of age, with a median age of 51.4 years.

A woman is said to be in menopause after she has gone for one full year without periods. While most women in the United States go through menopause around the age of 51, a small number will experience menopause as early as age 40 or as late as their late 50s. Rarely, menopause occurs after age 60. When menopause is diagnosed before age 40, it is considered to be abnormal or premature menopause.

Perimenopause, also known as the climacteric, includes the time before menopause when hormonal and biological changes and physical symptoms begin to occur. This period lasts for an average of three to five years.

A woman can have irregular periods for several months to years before her periods finally stop. Any vaginal bleeding that develops after a year of no periods is abnormal and should be evaluated by a doctor.

Sleep often is disturbed by nighttime hot flashes. A long-term lack of sleep can lead to changes in moods and emotions. The chemical changes that happen during menopause do not increase the risk of depression. However, many women experience major life changes during their middle age including menopause and sleep disturbances, which can increase the risk of developing depression.

For most women, the diagnosis of menopause is made based on a woman's description of her symptoms and the ending of her menstrual periods. Laboratory testing is not usually needed.

Because women can still become pregnant while they are perimenopausal, doctors may do a pregnancy test when a woman's periods become irregular, infrequent or light. In some cases, a blood test for levels of follicle-stimulating hormone (FSH) may be recommended. FSH levels are normally high in menopause, so high FSH levels can help to confirm that a woman is in menopause.

At the time of menopause, doctors often recommend a bone density measurement. The test result sometimes will detect early osteoporosis. More often the result is used as a baseline to compare rate of bone loss in the future.

Perimenopause usually lasts three to five years but it can take as few as two years or as many as eight years for some women. The changes in the body that occur during menopause last for the rest of a woman's life. However hot flashes usually improve over time, becoming less frequent and less severe

Menopause is a natural event and cannot be prevented. Medications, diet and exercise can prevent or eliminate some symptoms of menopause and enhance a woman's quality of life as she grows older.

However, recent evidence has shown that there are some risks associated with the use of these medicines. Estrogen therapy can increase the risk of heart disease, stroke, breast cancer and blood clots in a small number of women. On the other hand, it prevents fractures and can decrease the risk of colon cancer. Therefore, the decision to use hormone replacement therapy to treat symptoms of menopause is an individual decision. A woman should talk to her doctor about the risks and benefits of hormone replacement therapy for her.

Etidronate (Didronel), alendronate (Fosamax) and other similar drugs are the most effective medicines that can be used to both prevent and treat osteoporosis. They increase bone density and decrease the risk of fractures.

The use of soy products in the diet such as tofu may have benefit for some women. Soy has small amounts of phytoestrogens (plant estrogens) that may help relieve hot flashes. Researchers speculate that the soy-based diet of Japanese women plays a role in preventing hot flashes. However, it's not clear whether Japanese women have fewer hot flashes or whether they report this problem less often.

Definitions and terms on this page

Anxiety

• A state of uneasiness and apprehension, as about future uncertainties.


• Worry or tension in response to real or imagined stress, danger, or dreaded situations. Physical reactions such as fast pulse, sweating, trembling, fatigue, and weakness may accompany anxiety.

Chlorella

• Chlorella is a genus of single-celled green algae, belonging to the phylum Chlorophyta. It is spherical in shape, about 2 to 10 nm in diameter, and is without flagella. Chlorella contains the green photosynthetic pigments chlorophyll-a and -b in its chloroplast. It depends on photosynthesis for growth and multiplies rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals..

Estrogen

• Any one of a group of hormones synthesized by the reproductive organs and adrenal glands in females and, in lesser quantities, in males. The estrogens cause the thickening of the lining of the uterus and vagina in the early phase of the ovulatory, or menstrual, cycle; in lower animals cyclical estrogen secretion also induces estrus, or "heat". The estrogens are also responsible for female secondary sex characteristics such as, in humans, pubic hair and breasts, and they affect other tissues including the genital organs, skin, hair, blood vessels, bone, and pelvic muscles..

Menopause

• The period marked by the natural and permanent cessation of menstruation, occurring usually between the ages of 45 and 55.

PMS

• Premenstrual syndrome.

Perimenopause

• The time period prior to menopause that may last 10 to 15 years, even beginning in one's 30s. It is associated with decreased ovarian function and decreasing estrogen levels.

Progesterone

• Steroid hormone secreted by the female reproductive system that functions mainly to regulate the condition of the endometrium (see uterus), preparing it to accept a fertilized egg. If the egg is not fertilized, the level of progesterone drops, the uterine lining breaks down, and menstruation ensues. If the egg is fertilized, the placenta produces progesterone, whose effects include preparing the mammary glands for lactation..

Biopsy

• Bone marrow aspiration, also called bone marrow sampling, is the removal by suction of fluid from the soft, spongy material that lines the inside of most bones. Bone marrow biopsy, or needle biopsy, is the removal of a small piece of bone marrow.

Climacteric

• A period of life characterized by physiological and psychic change that marks the end of the reproductive capacity of women and terminates with the completion of menopause.


• A corresponding period sometimes occurring in men that may be marked by a reduction in sexual activity, although fertility is retained.

Depression

• In psychiatry, a symptom of mood disorder characterized by intense feelings of loss, sadness, hopelessness, failure, and rejection.

Estrogen

• Any one of a group of hormones synthesized by the reproductive organs and adrenal glands in females and, in lesser quantities, in males.

Hormone

• A substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism.

Osteoporosis

• A disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse.

Premenstrual syndrome

• The syndrome occurs in several distinct forms: emotional upheaval, including anxiety, irritability, insomnia, depression, forgetfulness, confusion, and lethargy; cravings for sweets, increased appetite, and intolerance to sugar (headache, heart palpitations, fatigue, and fainting); and fluid retention symptoms with weight gain, puffiness of hands and feet, breast swelling and tenderness, and abdominal bloating and tenderness. Some women suffer with symptoms of all these forms, others only a few..

Progesterone

• A drug prepared from natural or synthetic progesterone, used in the prevention of miscarriage, in the treatment of menstrual disorders, and as a constituent of some oral contraceptives.


• A female hormone that acts on the inner lining of the uterus and prepares it for implantation of the fertilized egg.

Stress

• A state of extreme difficulty, pressure, or strain.


• A physical and psychological response that results from being exposed to a demand or pressure.

Testosterone

• A white crystalline steroid hormone, C19H28O2, produced primarily in the testes and responsible for the development and maintenance of male secondary sex characteristics. It is also produced synthetically for use in medical treatment.

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