Skip to content

Menopause Health Center

Select An Article

Menopause Causes

    Font Size

    Menopause occurs naturally when a woman's ovaries run out of functioning eggs. 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.
     

    Normally, FSH, or follicle-stimulating hormone (a reproductive hormone), is the substance responsible for the growth of ovarian follicles (eggs) during the first half of a woman's menstrual cycle. As menopause approaches, the remaining eggs become more resistant to FSH, and the ovaries dramatically reduce their production of a hormone called estrogen.

    Estrogen affects many parts of the body, including the blood vessels, heart, bone, breasts, uterus, urinary system, skin, and brain. Loss of estrogen is believed to be the cause of many of the symptoms associated with menopause. At the time of menopause, the ovaries also decrease their production of testosterone -- a hormone involved with sex drive.

    Recommended Related to Menopause

    Quitting Hormone Replacement Therapy

    If you’ve been on hormone replacement therapy (HRT) for a while to relieve menopause symptoms, you may be wondering, what now? Should you stop taking it? If so, when? And how do you go about it? If you are healthy, most experts agree that HRT is safe to use at the lowest dose that helps for the shortest time needed. If you're 59 or older, or have been on hormones for 5 years, you should talk to your doctor about quitting.

    Read the Quitting Hormone Replacement Therapy article > >

     

    WebMD Medical Reference from eMedicineHealth

    Reviewed by Traci C. Johnson, MD, FACOG on July 13, 2014
    Next Article:

    Today on WebMD

    woman walking outdoors
    How to handle headaches, night sweats, and more.
    mature woman holding fan in face
    Symptoms and treatments.
     
    woman hiding face behind hands
    11 ways to keep skin bright and healthy.
    insomnia
    Is it menopause or something else?
     
    senior couple
    Video
    mature woman shopping for produce
    Article
     
    Alcohol Disrupting Your Sleep
    Article
    mature couple on boat
    Article
     

    Pollen counts, treatment tips, and more.

    It's nothing to sneeze at.

    Loading ...

    Sending your email...

    This feature is temporarily unavailable. Please try again later.

    Thanks!

    Now check your email account on your mobile phone to download your new app.

    mature woman tugging on her loose skin
    Slideshow
    senior woman wearing green hat
    Article
     
    mature woman
    Article
    supplements
    Article
     

    WebMD Special Sections