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Perimenopause vs Menopause: What Is the Difference?

Many women start noticing changes years before their periods stop. That stage has a name, and it is often the most confusing one.

Updated October 9, 2026

What you'll learn

Menopause is defined as 12 months in a row without a period.¹
Perimenopause is the transition before it, when hormone levels fluctuate and periods become irregular.¹
Hot flashes, night sweats, sleep problems and mood changes are common in both stages.^1,2
Hormone therapy is the most effective treatment for hot flashes, according to The Menopause Society.²

Menopause

Menopause is a single point in time: it is confirmed once you have gone 12 months in a row without a period.¹ In the United States it most often happens in a woman's early fifties, but the range is wide.¹

Perimenopause

Perimenopause is the transition leading up to that point, and it can last several years. Estrogen and progesterone levels rise and fall unevenly, which is why symptoms can come and go and periods become irregular.¹

Common symptoms

Hot flashes and night sweats¹
Trouble sleeping¹
Mood changes¹
Vaginal dryness and discomfort during sex^1,2
Irregular periods, in perimenopause¹

Symptoms vary enormously. Some women have few; others find them disruptive for years.

Treatment options

The Menopause Society's 2022 position statement describes hormone therapy as the most effective treatment for hot flashes and night sweats and for the genitourinary symptoms of menopause.² It also states that for healthy women under 60, or within 10 years of menopause, the benefits of hormone therapy generally outweigh the risks for those with bothersome symptoms.² Non-hormonal options exist for women who cannot or prefer not to use hormones.

Talking to a clinician

A clinician will ask about your periods, symptoms, whether you still have a uterus, and your personal and family history of breast cancer, blood clots and heart disease. Those answers decide which options are safe.²

Talk to a clinician. This article explains the evidence; it cannot tell you what is right for you. A licensed clinician who knows your health history and medications can.

Important safety information. Estrogen therapy is not appropriate for everyone. Women with a history of breast or uterine cancer, blood clots, stroke, heart attack, liver disease or unexplained vaginal bleeding need specialist advice, and estrogen should not be used during pregnancy.³ Women who still have a uterus are generally prescribed a progestogen such as progesterone alongside systemic estrogen to protect the uterine lining.² Report any unexpected bleeding, breast changes, leg swelling, chest pain or sudden headache to a clinician right away.³ Only a licensed clinician who knows your health history should decide whether hormone therapy is appropriate for you.

Your questions, answered

What is the difference between perimenopause and menopause?

Perimenopause is the transition before menopause, when hormones fluctuate and periods become irregular. Menopause is confirmed after 12 months in a row without a period.

What is the most effective treatment for hot flashes?

According to The Menopause Society, hormone therapy is the most effective treatment for hot flashes and night sweats.

Keep learning

References

Menopause. MedlinePlus, U.S. National Library of Medicine.
The North American Menopause Society. The 2022 hormone therapy position statement of The North American Menopause Society. Menopause. 2022. PubMed 35797481.
Estrogen. MedlinePlus Drug Information, U.S. National Library of Medicine.