Perimenopause is the transition leading up to menopause. During these years, the ovaries gradually make less estrogen and progesterone, and hormone levels can swing up and down from month to month. Those swings are behind many of the changes women notice, from irregular periods to hot flashes and poor sleep.
Perimenopause most often begins in a woman’s 40s, though it can start in the late 30s. It typically lasts several years. It ends at menopause, which is defined as 12 months in a row without a period. Women who have had a hysterectomy but kept their ovaries still go through perimenopause, even without periods to track.
Because hormone levels change so much during this time, perimenopause is usually identified by your age, your symptoms, and changes in your cycle rather than by a single blood test. Bloodwork is still useful to rule out other causes, such as thyroid problems.
Perimenopause care is part of the hormone replacement therapy services we offer at ThinWorks.