Biological changes in the body occur during perimenopause: The first of these occur when the ovaries begin to lose follicles which triggers a slow and inconsistent decline in estrogen production. Because the decline of estrogen is both slow and inconsistent, women usually experience symptoms such as menstrual irregularities on an inconsistent basis –- for example, a women may have periods that are unpredictable for several months and then have normal menstrual cycles for a few months.
There is no reliable test for perimenopause. You and your physician can determine when you’re perimenopausal by evaluating your symptoms such as the irregular periods described above. Other common symptoms of perimenopause include hot flashes and night sweats; problems sleeping; mood swings; vaginal dryness; and headaches or increased headaches. Because the symptoms of perimenopause also are symptoms of other diseases or conditions, you should discuss your symptoms with your doctor to rule out other causes.
Source:
"Could I Be In Menopause;” National Women’s Health Resource Center; accessed 09/12/07.
