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Menopause, the time when a woman stops having menstrual periods, is not a disease or an illness. It is a transition between two phases of a woman's life.
Many women experience a variety of symptoms as a result of the hormonal changes associated with the transition through menopause. Around the time of menopause, women often lose bone density and their blood cholesterol levels may worsen, increasing their risk of heart disease.
Premature menopause: The average age of US women at the time of menopause is 51 years. The most common age range at which women experience menopause is 48-55 years. If menopause occurs in a woman younger than 40 years, it is considered to be premature. Menopause is considered late if it occurs in a woman older than 55 years. For most women, menopause is a normal occurrence.
Perimenopause: The hormonal changes associated with menopause actually begin prior to the last menstrual period, during a three to five year period called the perimenopause. During this transition, women may begin to experience menopausal symptoms and may lose bone density, even though they are still menstruating.
Surgical menopause: Surgical menopause is menopause induced by the removal of the ovaries. Women who have had surgical menopause often have a sudden and severe onset of the symptoms of menopause.
Menopause occurs due to a complex series of hormonal changes. Associated with the menopause is a decline in the number of functioning eggs within the ovaries. At the time of birth, most females have about 1 to 3 million eggs, which are gradually lost throughout a woman's life. By the time of a girl's first menstrual period, she has an average of about 400,000 eggs. By the time of menopause, a woman may have fewer than 10,000 eggs. A small percentage of these eggs are lost through normal ovulation (the monthly cycle). Most eggs die off through a process called atresia (the degeneration and subsequent resorption of immature ovarian follicles - fluid filled cysts that contain the eggs).
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