Signs of perimenopause: what shows up first
The most common first sign of perimenopause is a change in your periods: cycles that run a little shorter or longer, flow that is heavier or lighter, then skipped months. [1][2][3] It usually starts in a woman's mid-to-late 40s, and for most women it lasts about four years before periods stop for good. [1]
What is usually the first sign of perimenopause?
The Office on Women's Health says irregular periods may be your first sign. [1] The Menopause Society describes the early changes as subtle: cycles commonly get a little shorter, the number of bleeding days can go up or down, and flow can be heavier or lighter. [2] As perimenopause goes on, cycle length can vary by seven days or more, and in the late transition women may skip 60 days or more. [2] ACOG, the obstetricians' and gynecologists' professional body, puts it the same way for your 40s: periods may be shorter or longer, the gap between them may grow or shrink, and you may skip some. [7]
Because these changes happen slowly, you may not notice them at first. [7] That is the practical reason to track your cycle on a calendar or an app: the Menopause Society suggests it so the pattern can be reviewed with a clinician. [2]
What other signs of perimenopause are common?
Hot flashes and night sweats are the most commonly reported symptoms of the transition; one large US study found that up to 80% of women experience them at some point. [2] The Menopause Society lists vaginal dryness, sleep disturbances and mood changes as the other common ones. [5] The National Institute on Aging adds joint and muscle discomfort, pain during sex, forgetfulness and difficulty concentrating to its list. [4] Brain fog deserves its own sentence: the Menopause Society says 40 to 60 percent of midlife women report cognitive symptoms such as forgetfulness during the transition, that the changes are typically mild and within normal limits, and that dementia at midlife is very rare. [2] Bladder and urinary problems also show up for many women around this time; the Office on Women's Health says they are not a normal part of aging and can be treated. [6]
How much of this you get varies a lot. Some women have no symptoms or very mild ones; for others the symptoms begin suddenly and are very noticeable. [1] Many women report no physical change at all during perimenopause except irregular periods. [5]
Mood changes, and when they are something more
Feeling moodier or more irritable around this time is common, and scientists don't know exactly why. [4] The Menopause Society says women appear particularly vulnerable to depression during the perimenopause years and the years right after menopause, and that those with a history of depressed mood earlier in life are at greatest risk. [2] The Office on Women's Health draws the line plainly: mood changes are not the same as depression, which is a different, serious illness that also needs treatment, and if you have symptoms of depression or anxiety you should see your health care provider. [6]
If you are in crisis, call or text 988 (US), any time, free and confidential.
At what age do signs of perimenopause start?
Usually in the mid-to-late 40s. [1] The National Institute on Aging says most women begin the transition between 45 and 55. [4] ACOG notes that estrogen output starts to fluctuate in your 30s and 40s, with the phase itself usually beginning in the mid-40s. [3][7] Smoking is linked to reaching menopause up to two years earlier. [1]
The transition ends at menopause, which you only know in hindsight: twelve months in a row without a period, including spotting. [1][4] The average age of menopause in the United States is 52 according to the Office on Women's Health and the National Institute on Aging, and 51 according to ACOG; the usual range is 45 to 58. [1][4][3]
How long do perimenopause symptoms last?
Perimenopause can last between two and eight years before periods stop; for most women it is about four. [1] The National Institute on Aging gives the same two-to-eight-year range for menopause-related symptoms and stresses that timing and symptoms are highly variable from one woman to the next. [4] Most symptoms improve after menopause, even without treatment. [5] Hot flashes are the exception for some women: the Office on Women's Health says they can continue for up to 14 years after menopause. [6]
Is there a test for perimenopause?
Usually not one you need. Hormone levels go up and down unpredictably during the transition, so a single blood test can't tell you for sure where you are, and health care providers don't usually recommend one unless there is a medical reason, such as periods stopping before 40. [1] What your doctor can do is ask about your age, your symptoms and your family history to judge whether the transition is the likely cause. [4]
In the UK, the NICE guideline goes further. It says healthy women aged 45 or over with recently started hot flashes and a change in their cycle can be identified as perimenopausal without laboratory tests, and that tests such as anti-Müllerian hormone, estradiol and antral follicle count should not be used for this purpose at that age. [9] That is UK guidance, not US practice, but it is useful to know when someone tells you a hormone test came back "normal."
What to bring to the appointment
A record of your periods: dates, length, flow. The Menopause Society suggests a calendar or phone app so the pattern can be reviewed. [2] Your symptoms and how much they bother you. [6] Your age and family history; the age your mother reached menopause is one clue to yours. [4][1] And your questions. If you want treatment, the options include lifestyle changes, non-hormone medicines and hormones, and that decision belongs to you and your clinician. [4]
Can you still get pregnant in perimenopause?
Yes. You may still ovulate in some months, and it is impossible to know which, so if you don't want to get pregnant the advice is to keep using birth control until a full year after your last period. [1][2]
When to talk to your clinician
Changes in your periods are expected in perimenopause, but ACOG says you should still report them, because abnormal bleeding can be a sign of a health problem. [3][7] ACOG says it is not normal to have bleeding or spotting between periods, bleeding or spotting after sex, bleeding that is heavier or lasts more days than usual, or any bleeding after menopause. [7] Heavy, by ACOG's definition, means bleeding that lasts more than seven days, soaks through one or more pads or tampons every hour for several hours in a row, needs changes during the night, or comes with clots the size of a quarter or larger. [8] The National Institute on Aging adds two more: periods that come very close together, and bleeding or spotting that starts again after more than a year without a period. [4] And if any symptom on this page bothers you, that alone is reason enough for the appointment. [6]
Sources
- Office on Women's Health (US Department of Health and Human Services), Menopause basics. Page last updated April 2, 2026. Retrieved 2026-10-17.
- The Menopause Society, Perimenopause (patient education). No revision date shown on the page. Retrieved 2026-10-17.
- American College of Obstetricians and Gynecologists, The Menopause Years (FAQ). Last reviewed December 2025. Retrieved 2026-10-17.
- National Institute on Aging, What Is Menopause? Content reviewed October 16, 2024. Retrieved 2026-10-17.
- The Menopause Society, Symptoms (patient education). No revision date shown on the page. Retrieved 2026-10-17.
- Office on Women's Health, Menopause symptoms and relief. Page last updated May 30, 2025. Retrieved 2026-10-17.
- American College of Obstetricians and Gynecologists, Perimenopausal Bleeding and Bleeding After Menopause (FAQ). Last reviewed February 2024. Retrieved 2026-10-17.
- American College of Obstetricians and Gynecologists, Heavy Menstrual Bleeding (FAQ). Last reviewed May 2026. Retrieved 2026-10-17.
- National Institute for Health and Care Excellence (UK), Menopause: identification and management, NG23, recommendations 1.3.1 and 1.3.4. Last updated April 15, 2026. Retrieved 2026-10-17. UK guidance.
Every statement above was checked against the linked page on October 17, 2026. This article is education, not individual medical advice. Get the free 7-Day Midlife Sleep Reset.