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Heavy Bleeding in Perimenopause: Causes, Warning Signs and Treatments

Heavy periods are common in perimenopause but can cause anemia and may signal other problems. Learn what counts as heavy, when to get checked and what helps.

Written by

Sunita Rao

Evidence-led health information

Woman in her late 40s resting on a sofa under a soft muted sage throw with a warm water bottle across her lap, a glass of water on the side table…

Heavy periods are common in perimenopause, because irregular ovulation lets the womb lining build up more than usual. Bleeding is considered heavy if it lasts more than 7 days, soaks through pads or tampons every hour for several hours, or includes large clots. It can cause anemia and may have other causes, so get it checked. Effective treatments are available.

What counts as heavy bleeding?

According to ACOG, signs of heavy menstrual bleeding include:

Bleeding that lasts more than 7 days
Soaking through one or more pads or tampons every hour for several hours in a row
Needing to wear more than one pad at a time
Needing to change protection during the night
Passing blood clots the size of a quarter (about 2.5 cm) or larger

It’s also heavy if it affects your daily life, for example if you plan activities around bleeding, avoid going out, or worry about leaking.

Why does perimenopause cause heavy bleeding?

In perimenopause, ovulation becomes irregular. Estrogen can stay high or swing higher than usual, while progesterone, which normally stabilizes the womb lining after ovulation, is missing in cycles where no egg is released.

Without that progesterone, the lining can build up more than usual and then shed heavily and unpredictably. This is why a heavy period often follows a skipped month. The Australasian Menopause Society notes that heavy bleeding, rather than irregular bleeding itself, is a hallmark of abnormal build-up of the womb lining. See hormone changes during perimenopause.

What else can cause heavy bleeding?

Heavy bleeding in midlife has several possible causes, and more than one may be present:

Fibroids, non-cancerous growths in the womb muscle, which are common in the 40s
Polyps in the womb lining or cervix
Adenomyosis, where womb-lining tissue grows into the muscle wall
Thickening of the womb lining (endometrial hyperplasia), which is more likely with prolonged unopposed estrogen and can occasionally become cancerous
Womb (endometrial) cancer, which is uncommon but becomes more likely with age, and is why persistent or unusual bleeding needs investigating
Thyroid problems
Bleeding disorders or blood-thinning medicines
The copper IUD, which can make periods heavier
Pregnancy complications, such as miscarriage

See perimenopause or something else.

Can heavy bleeding cause anemia?

Yes. ACOG notes that blood loss from heavy periods can lead to iron-deficiency anemia, and severe anemia can cause shortness of breath and heart problems. Signs of anemia include:

Tiredness and lack of energy
Breathlessness, particularly on exertion
Dizziness or light-headedness
Pale skin
A fast or pounding heartbeat. See heart palpitations.
Headaches and difficulty concentrating

Iron deficiency is easily mistaken for menopause-related fatigue. If your periods are heavy and you’re tired, ask about a blood test.

What will a clinician assess?

A clinician will usually:

Ask about your bleeding pattern, how heavy it is, and how it affects your life. A bleeding diary helps.
Check for pregnancy if there’s any chance.
Arrange blood tests, including a full blood count to check for anemia, and sometimes iron levels and thyroid function.
Examine you, including a pelvic examination, and check your cervical screening is up to date.
Arrange an ultrasound to look at the womb and its lining, particularly if bleeding is persistent, prolonged, or you have risk factors.
Sample the womb lining in some cases, for example if the lining is thickened or bleeding is persistent.

What treatments help heavy bleeding?

Options depend on the cause, your contraception needs and your preferences.

Hormonal IUD (levonorgestrel intrauterine device)

Reduces heavy and irregular bleeding at any age
Provides contraception
Can later form the progestogen part of HRT

Medicines taken only during bleeding

Tranexamic acid helps blood clot in the womb and can make periods lighter.
Anti-inflammatory medicines, such as mefenamic acid, can reduce bleeding and period pain.

Hormonal tablets

Combined hormonal contraception can reduce bleeding and regulate cycles for people under 50 who can use it safely.
Progestogen tablets can help some people, although some have more frequent bleeding.

Iron

Iron supplements treat iron-deficiency anemia, usually alongside treatment for the bleeding itself.

Procedures

If medicines don’t help, or there is a structural cause, options include removing polyps or fibroids, endometrial ablation to thin the womb lining, or hysterectomy.

Treatment options at a glance

Option	How it’s used	Also provides contraception?	Worth knowing
Hormonal IUD	Placed in the womb; lasts several years	Yes	Reduces heavy and irregular bleeding; can later form part of HRT
Tranexamic acid	Tablets taken only on bleeding days	No	Reduces blood loss; not suitable for everyone, for example with some clotting risks
Anti-inflammatory medicines	Tablets taken around and during bleeding	No	Also ease period pain; not suitable with some stomach or kidney problems
Combined hormonal contraception	Daily pill, patch or ring	Yes	Can regulate cycles for people under 50 who can use it safely
Progestogen tablets	Daily or cyclical tablets	Some types	Can help some people, but may cause irregular spotting
Procedures	Removing polyps or fibroids, ablation, or hysterectomy	:	Considered when medicines don’t help or there’s a structural cause

A general guide; your clinician will advise on what suits you.

Practical steps that may help

Keep a bleeding diary, recording days, heaviness, clots and changes of protection. Our private Symptom Explorer can help.
Use higher-absorbency protection, period underwear or a menstrual cup, and carry spares.
Protect your bed with a waterproof mattress protector or towel on heavy nights.
Eat iron-rich foods, such as red meat, beans, lentils, dark leafy greens and fortified cereals.
Rest when you need to, especially on the heaviest days.
Keep using contraception if you don’t want to become pregnant. See pregnancy during perimenopause.

When should you get help?

See a clinician promptly if you have:

Bleeding that meets the definition of heavy above

Bleeding after sex, or bleeding between periods

Periods lasting more than 7 days, or coming more often than every 21 days

Tiredness, breathlessness or dizziness with heavy periods

Any bleeding 12 months or more after your last period

Seek emergency care immediately if you’re soaking through pads or tampons every hour for more than 2 hours and also have chest pain, shortness of breath, or feel light-headed or faint. ACOG advises emergency care in this situation.

Managing heavy bleeding at work and on the go

Carry a small kit: spare protection, period underwear, painkillers, a change of underwear and wipes.
Wear darker clothing on heavy days if it helps you feel more confident.
Know where facilities are, and consider asking for easy access to toilets or flexible breaks if bleeding is very heavy.
Plan heavier-day tasks, where possible, around predictable patterns shown in your bleeding diary.

Heavy bleeding is a legitimate health issue. Many workplaces now recognize menopause-related symptoms in their policies.

Questions to ask at your appointment

What could be causing my heavy bleeding?
Do I need an ultrasound or a sample of my womb lining?
Am I anemic, and do I need iron?
Which treatment would suit me: a hormonal IUD, medicines during bleeding, or hormonal tablets?
Do I still need contraception, and could the same treatment provide it?

Irregular periods · Fatigue · Heart palpitations

Frequently asked questions

Is heavy bleeding normal in perimenopause?

Heavier periods are common in perimenopause, but very heavy or prolonged bleeding isn’t something to ignore. It should be assessed to rule out other causes and anemia.

Why am I passing clots during my period?

Clots can form when bleeding is heavy. Clots the size of a quarter (about 2.5 cm) or larger are a sign of heavy bleeding and worth discussing with a clinician.

Can a hormonal coil help with heavy perimenopausal bleeding?

Yes. The hormonal IUD reduces heavy and irregular bleeding, provides contraception, and can later form part of HRT.

Could heavy bleeding be cancer?

Most heavy bleeding in perimenopause has a non-cancerous cause. However, womb cancer becomes more likely with age, which is why persistent, prolonged or unusual bleeding needs investigating.

References

Editorial status: evidence-based educational article; not individually medically reviewed. Last evidence check: September 10, 2026.