Women's health
Periods after 40
Periods often change through the forties as ovarian hormone levels begin to fluctuate before menopause. Cycles may shorten, lengthen or become heavier, but some changes, particularly very heavy or erratic bleeding, deserve a proper check.
Key points
The essentials at a glance.
What to look out for, who treats it, and what usually happens next.
-
Shorter cycles, heavier flow and more variable timing are common in the years before menopause
-
Very heavy bleeding, bleeding between periods or after sex, or cycles closer than 21 days should be assessed
-
Blood tests alone cannot reliably diagnose perimenopause; the pattern of symptoms matters more
-
An ultrasound and sometimes an endometrial biopsy are used to rule out polyps, fibroids and womb-lining changes
-
Treatment options include the hormonal coil, tranexamic acid, cycle regulation and HRT once perimenopausal symptoms appear
Understanding it
About Periods after 40.
From around 40 onwards, the ovaries respond less predictably to hormonal signals, so ovulation becomes erratic and progesterone levels fall. The result is cycles that shorten, then space out, and bleeding that can become noticeably heavier or more prolonged. These changes are usually part of perimenopause, but they overlap with symptoms of fibroids, polyps and, rarely, womb-lining abnormalities.
A gynaecologist will usually arrange a pelvic ultrasound, and where bleeding is heavy or erratic, a hysteroscopy or endometrial biopsy to check the womb lining. Once serious causes are excluded, effective options include the levonorgestrel coil, tranexamic acid and, for wider perimenopausal symptoms, HRT. In the UK you can start with your GP: on the NHS, a routine referral to a specialist clinic often means waiting 20–45 weeks or more to be seen, while a private consultant will typically see you within around two weeks, with any tests arranged soon after.
Frequently asked
Common questions about Periods after 40.
Quick, plain-English answers to what people ask us most.
-
What changes happen to periods after 40?
As you approach perimenopause, periods often become less predictable, changing in frequency, flow, and duration as ovarian hormone production starts to fluctuate. Some cycles may be shorter, others longer, with variable flow.
-
What causes these changes?
Declining and fluctuating oestrogen and progesterone levels as the ovaries gradually run low on egg reserves are the main driver. This is a normal part of the transition towards menopause.
-
What period changes are considered normal after 40?
Cycle length varying by several days, changes in flow, and occasional skipped periods are all typically normal features of perimenopause. Gradual change over months to years is expected.
-
When are period changes after 40 a cause for concern?
Very heavy bleeding, bleeding between periods, bleeding after sex, or periods lasting much longer than usual should be checked, as these can sometimes indicate fibroids, polyps, or, rarely, something more serious that needs ruling out.
-
Is early perimenopause hereditary?
The age at which perimenopause begins does have a genetic influence, so family history can be a useful guide to what to expect, though it's not a certainty.
-
Can irregular periods after 40 be treated?
Yes, if changes are troublesome, options include hormonal treatments such as the combined pill or a hormonal coil, or other medications to manage heavy bleeding, tailored to your individual symptoms and health history.
-
How are period changes after 40 investigated?
Assessment typically involves a discussion of your cycle history, an examination, and sometimes an ultrasound scan or blood tests to check hormone levels and rule out structural causes such as fibroids or polyps.
-
How long does the transition to menopause usually take?
Perimenopause typically lasts a few years, though it varies considerably between individuals, ending once periods have stopped completely for 12 months.
-
Perimenopause bleeding vs abnormal uterine bleeding — what's the difference?
Typical perimenopausal changes are gradual and vary within a broad but recognisable range, while abnormal bleeding, such as very heavy flow, bleeding between periods, or post-coital bleeding, warrants specific investigation to rule out other causes.
-
When should I see a doctor about periods after 40, and how quickly can I be seen privately?
See a doctor promptly for any bleeding between periods, after sex, or unusually heavy flow. Private gynaecology assessment is usually available within about two weeks, notably quicker than typical NHS routine referral waits.