Heavy periods in perimenopause: flooding, clots and when to worry

Name: Heavy periods in perimenopause: flooding, clots and when to worry
Creator: MenoWoman

Heavy periods are common in perimenopause because hormone levels swing and ovulation becomes irregular. Effective treatments exist, but heavy, very long or between-period bleeding should be checked, and any bleeding after menopause needs a doctor.

Researched by the MenoWoman team. Edited by Marcela Sat. Updated 7 November 2026. We may earn from links.

Any bleeding or spotting after menopause (12 months with no period) needs a doctor, even once and even if light. In perimenopause, see a doctor for bleeding between periods or after sex, much longer periods, or heavy bleeding. Get urgent care if you soak a pad or tampon every hour for several hours, feel faint, dizzy or breathless, or have chest pain, or if you could be pregnant and have bleeding with one-sided low tummy pain.

What counts as a heavy period

Doctors define a heavy period as bleeding that affects your physical, emotional or social life.² Measuring blood loss is impractical, so signs matter more.¹

passing large clots¹
soaking a pad or tampon every hour or so¹
“flooding” through clothes or bedding
needing double protection or getting up at night to change

Heavy bleeding can lower your iron and lead to anemia. This can add to tiredness, which is easy to blame on menopause alone.² A blood count can check for this.¹

Why periods change in perimenopause

In perimenopause, ovulation happens less often. This is normal for this stage.¹ Some months estrogen is low and periods are light or skipped. Then a sharp rise in estrogen can build a thick lining that sheds as a very heavy period.²

This is why irregular periods are so common. Cycles may get shorter, then longer, with heavy and light months mixed together.

Growths in the womb also become more common with age. Fibroids affect about 40% of women over 40. Polyps, adenomyosis and a thickened lining (endometrial hyperplasia) also need to be ruled out.² Hyperplasia is more likely with age over 40, obesity and long exposure to estrogen without progesterone.²

Pregnancy is still possible in perimenopause. A pregnancy test is a standard first check for unusual bleeding.¹

When bleeding is a red flag

The Australasian Menopause Society advises that any prolonged or heavy bleeding in perimenopause should be investigated.² Bleeding between periods and very long periods, lasting around two weeks or more, are key warning signs.²

A doctor may arrange blood tests (blood count, iron, thyroid) and an internal (transvaginal) ultrasound.^1,2 US guidance suggests sampling the womb lining for women aged 45 and over with abnormal bleeding.¹

If you take hormone therapy, irregular bleeding is common in the first six months.⁵ Bleeding that starts after that, or does not settle, needs checking.⁵

Postmenopausal bleeding: always get it checked

You reach menopause after 12 months with no period. Any bleeding after that point is called postmenopausal bleeding.³ It is never something to wait out. See a doctor as soon as you can, even if it is light, brown or happens only once.³

Most causes are harmless. They include a thin, fragile lining, polyps, fibroids, infection and medicines such as hormone therapy or tamoxifen.³ But bleeding can also be the first sign of womb (endometrial) cancer or a thickened lining.³

In a large review of 129 studies, about 9% of women with postmenopausal bleeding had endometrial cancer. About 91% of women with endometrial cancer had bled first.⁴ That is why every episode of bleeding after menopause should be checked.

Treatments for heavy periods

Once serious causes are ruled out, there are several options. A doctor can help you choose based on your health, contraception needs and preferences.

Hormonal IUD (levonorgestrel coil): the most effective medical option, and it also works as contraception.^1,2
Tranexamic acid: a non-hormonal tablet taken only on heavy days. It can cut blood loss by up to about half.^1,2 Rules on prescription differ by country.
Anti-inflammatory painkillers (NSAIDs): reduce bleeding a little and ease cramps, taken only during bleeding.¹
Combined pill or progestogen tablets: can control bleeding, but the pill is not suitable for everyone over 40. About one in eight women notice mood changes on progestogens.^1,2
Endometrial ablation or surgery: for women who do not want a future pregnancy, when medicines are not enough.^1,2

Hormone therapy for menopause symptoms can sometimes make perimenopausal bleeding worse.² Absorbent period and leak underwear (period pants in the UK) can help with flooding while you wait for treatment to work.

What helps: options rated

Option	Evidence	What the research shows
Hormonal IUD (levonorgestrel)	Strong evidence	The most effective medical treatment in reviews, cutting blood loss by roughly 71% to 95%.¹
Tranexamic acid	Strong evidence	Non-hormonal and taken only during bleeding; trials show it can cut blood loss by up to about half.^1,2
NSAIDs (e.g. ibuprofen, naproxen)	Strong evidence	Consistently reduce blood loss in trials, though less than other options.¹ Not suitable for everyone; ask a doctor or pharmacist.
Combined hormonal contraception	Strong evidence	Reduces blood loss and regulates cycles.¹ Needs a risk check in women over 40 and is generally used only up to around age 50.²
Endometrial ablation	Strong evidence	About as effective as the hormonal IUD in reviews; only for women who do not plan a pregnancy.^1,2
Progestogen tablets	Some evidence	Continuous use reduces bleeding, but long-term satisfaction is low and mood side effects are common.^1,2

Ratings explained: how we rate. Always talk to a doctor or pharmacist before starting a medicine or supplement.