Perimenopause symptoms, timeline and treatment options

Perimenopause is the transition before your final period, and it usually begins in your 40s with changes in your cycle, hot flashes, night sweats, poor sleep or mood changes. It typically lasts several years. The symptoms are real and treatable: hormone therapy is the most effective option for hot flashes, and there are FDA-approved non-hormonal choices for women who cannot or prefer not to use hormones.

What is happening in your body

Your ovaries do not wind down smoothly. Through perimenopause the number of remaining follicles falls, ovulation becomes less regular, and estrogen levels rise and fall unpredictably, sometimes higher than in your 30s, sometimes much lower, often within the same cycle. Progesterone tends to drop as cycles without ovulation become more common.

That swinging, rather than a steady decline, explains why symptoms can come and go and why one month can feel very different from the next.

The timeline

The research framework used by most specialists, called STRAW+10, divides the transition into stages:

• Early perimenopause: cycle length starts to vary by a week or more from your usual pattern.
• Late perimenopause: you start skipping periods, with gaps of 60 days or longer. Hot flashes are often most frequent here.
• Menopause: confirmed after 12 months without a period.
• Postmenopause: everything after. Hot flashes may continue for years, and vaginal and urinary symptoms tend to persist unless treated.

The whole transition commonly takes about four to eight years, with wide variation. Large studies such as SWAN (the Study of Women's Health Across the Nation) found that hot flashes can last a median of around seven years overall, and longer in some groups, including Black women in that study.

Symptoms worth knowing about

Cycle changes

Usually the first sign. Periods get closer together, then further apart, heavier or lighter. Irregularity is expected, but some bleeding is not: very heavy bleeding that soaks through protection every hour, bleeding between periods, bleeding after sex, or any bleeding after 12 months without a period should be checked.

Hot flashes and night sweats

The most recognized symptoms, experienced by most women in the US at some point in the transition. Night sweats do extra damage by breaking up sleep.

Sleep

Trouble falling asleep, waking at 3 a.m., and sleep that does not feel restorative. Sleep loss alone can cause fatigue, irritability and poor concentration, which is part of why perimenopause is often mistaken for stress or a mood disorder.

Mood and thinking

Irritability, anxiety, low mood and brain fog are common. The risk of depression is higher during perimenopause, especially for women with a history of depression or premenstrual mood symptoms. Mood changes deserve attention on their own terms, not only as a hormone question.

Vaginal and urinary changes

Dryness, pain with sex, urgency and more frequent urinary infections, grouped under the term genitourinary syndrome of menopause. These tend to get worse over time without treatment, and they respond well to low-dose vaginal estrogen.

Other changes

Joint aches, palpitations, headaches, changes in hair and skin, and weight shifting toward the abdomen are all reported. Bone loss speeds up in the years around the final period, even without symptoms.

How it is diagnosed

For women over 45 with typical symptoms and changing cycles, The Menopause Society and most specialists diagnose perimenopause clinically. FSH and estradiol can swing from normal to menopausal levels and back within weeks, so a single blood test can easily mislead. Testing is more useful in specific situations: symptoms before age 40 or 45, after a hysterectomy when periods cannot be tracked, or when another condition such as thyroid disease needs ruling out. Our article on hormone health for women covers why perimenopause is so often missed.

Treatment options

Hormone therapy

Estrogen is the most effective treatment for hot flashes and night sweats, and it also prevents bone loss. Women with a uterus need a progestogen alongside estrogen to protect the uterine lining. During perimenopause, when cycles are still irregular, some women use low-dose birth control pills, which control bleeding and symptoms and provide contraception.

The Menopause Society's 2022 position statement concluded that for women under 60 or within 10 years of their final period, without contraindications, the benefit-risk balance is favorable for treating bothersome hot flashes and preventing bone loss. In November 2025 the FDA announced it would remove boxed warnings about cardiovascular disease, breast cancer and dementia from menopause hormone therapy labels. We explain what changed in more detail in our article on hormone therapy safety, and the decision still depends on your personal and family history.

Non-hormonal prescriptions

• Fezolinetant (Veozah) and elinzanetant (Lynkuet) work on brain pathways involved in temperature control. Both are FDA-approved for moderate to severe hot flashes. Fezolinetant carries a boxed warning about liver injury and requires liver tests.
• Low-dose paroxetine (Brisdelle) is FDA-approved for hot flashes. Other antidepressants, gabapentin and oxybutynin are sometimes used off-label.

Vaginal estrogen

Low-dose vaginal estrogen treats dryness, painful sex and urinary symptoms with very little absorption into the bloodstream. Many women who cannot use systemic hormones can still use it, though anyone with a history of breast cancer should discuss it with their oncologist.

Approaches with evidence behind them

Cognitive behavioral therapy and clinical hypnosis have good evidence for reducing how bothersome hot flashes are, and CBT for insomnia helps with sleep. Regular exercise and strength training help with mood, sleep and bone health. Many supplements marketed for menopause, such as black cohosh, have weak or inconsistent evidence.

When to get help

If symptoms are affecting your sleep, work, relationships or mood, that is reason enough to talk to a clinician. You do not need to wait until periods stop. A good evaluation looks at your symptoms, your cycle history, your personal and family risk factors and your preferences, then matches you to options. You can read about how we approach women's hormone care on our hormone therapy page, and if sleep is the dominant problem, our piece on sleep and mental health is a useful companion.

Questions patients ask us

At what age does perimenopause usually start?

Most women notice changes in their mid-to-late 40s, though some begin in their early 40s. The average age of menopause in the US is around 51, and the transition before it commonly lasts four to eight years. Symptoms of menopause before 40 are not typical perimenopause and should be evaluated separately.

What is usually the first sign of perimenopause?

Changes in your cycle are usually the first sign. Periods may come closer together, then further apart, or become heavier or lighter. Some women first notice sleep problems, night sweats or mood changes while their periods are still regular. Researchers classify early perimenopause as cycle length varying by seven days or more from your usual pattern.

Can a blood test tell me if I am in perimenopause?

Often not. FSH and estrogen swing widely during perimenopause, sometimes from normal to menopausal levels within weeks, so a single test can easily mislead. For women over 45 with typical symptoms, diagnosis is usually based on age, cycle changes and symptoms. Testing is more useful for women under 40 to 45 or after a hysterectomy.

How long do hot flashes last?

Longer than many people expect. The SWAN study found that hot flashes and night sweats lasted a median of about seven years overall, and longer in some groups. Some women have them briefly, others for more than a decade. Effective treatment is available at any stage, so you do not need to wait them out.

Can perimenopause cause anxiety and mood swings?

Yes. Irritability, anxiety and low mood are common, and the risk of depression rises during the transition, particularly for women with a history of depression or premenstrual mood symptoms. Poor sleep makes all of these worse. Mood symptoms deserve their own assessment and treatment rather than being dismissed as just hormones.

Can I still get pregnant during perimenopause?

Yes. Ovulation becomes less regular but does not stop until menopause. Contraception is generally recommended until you have gone 12 months without a period, or longer depending on your age and method. Some women use low-dose birth control pills in perimenopause, which also help control irregular bleeding and hot flashes.

What bleeding during perimenopause is not normal?

Very heavy bleeding that soaks through protection every hour or two, periods lasting much longer than usual, bleeding between periods or after sex, and any bleeding after 12 months without a period should be checked by a clinician. Irregular cycles are expected, but these patterns can have other causes that need evaluation.

Is hormone therapy safe during perimenopause?

For most healthy women under 60 or within 10 years of menopause, The Menopause Society's 2022 position statement concludes that the benefits of hormone therapy for bothersome symptoms generally outweigh the risks. Personal history matters, including blood clots, breast cancer and heart disease. A clinician should review your risks before you start.

What are non-hormonal treatments for hot flashes?

FDA-approved non-hormonal options include fezolinetant (Veozah), elinzanetant (Lynkuet) and low-dose paroxetine (Brisdelle). Some other antidepressants and gabapentin are used off-label. Cognitive behavioral therapy and clinical hypnosis have good evidence for reducing how bothersome hot flashes feel. Fezolinetant requires liver blood tests because of a boxed warning.

Do supplements help perimenopause symptoms?

The evidence for most supplements is weak or inconsistent. Black cohosh, soy isoflavones and evening primrose oil have been studied with mixed results, and supplement quality varies because they are not regulated like medicines. Some can interact with other medications. Tell your clinician about anything you take.