Understanding Perimenopause in Your 40s

Perimenopause is real, it is common, and you can feel like yourself again.

Irregular periods. Weight that settles on your belly. Wide awake at 3am. A shorter fuse with the kids. These are classic perimenopause symptoms, and you deserve clear answers. We explain what is happening in your body and which fixes are worth your money.

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Experiencing perimenopause
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Perimenopause questions answered

Frequently Asked Questions

Perimenopause is the transition before menopause, when estrogen and progesterone rise and fall unevenly. It usually starts in your 40s, sometimes in your late 30s, and it ends once you have gone 12 months in a row without a period.

Hormone changes most often begin in a woman's 40s, roughly four years before her final period. Some women notice changes in their late 30s. There is no set age, and family history, smoking and some medical treatments can make it start earlier. 

The most common first sign is a change in your cycle: periods that come closer together, further apart, heavier or lighter. Other early signs include worse PMS, waking in the night, new anxiety or irritability, and hot flashes

Symptoms last about four to five years on average, but the range is wide. For some women it is a few months, and for others it is closer to ten years. About one in ten women still have symptoms such as hot flashes into their 70s.

There is no single test that confirms perimenopause. Hormone levels swing from day to day, so one blood or urine result can look normal. Doctors usually diagnose it from your age, your symptoms and changes in your cycle. 

Falling estrogen shifts where the body stores fat, moving it toward the belly. At the same time, muscle mass declines with age, poor sleep raises appetite, and stress hormones rise. The result is weight gain even when your eating has not changed.

Some ingredients have modest evidence for specific symptoms, and many have very little. Supplements are not regulated like medicines, so quality varies. Our reviews compare each product's claims with the research, and you should check with your doctor before starting one.

Yes. You still ovulate some months during perimenopause, even when periods are irregular, so pregnancy is possible until you reach menopause. If you do not want to get pregnant, keep using birth control until your doctor confirms you have gone 12 months in a row without a period.

Yes. Shifting estrogen and progesterone affect mood-regulating brain chemicals, so new anxiety, low mood and irritability are common in perimenopause, even in women with no history of them. Poor sleep makes it worse. If low mood lasts more than two weeks or you have thoughts of harming yourself, contact a doctor right away.

Falling estrogen can trigger night sweats and hot flashes that wake you, and lower progesterone, which has a calming effect, makes sleep lighter. Many women wake between 2am and 4am and struggle to fall back asleep. Keeping the bedroom cool and limiting alcohol and late caffeine can help.

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