Heavy Menstrual Bleeding (Menorrhagia): Causes, Diagnosis and Treatment

What is menorrhagia?

Menorrhagia, meaning excessive blood loss during menstruation, is a common problem. The bleeding may be prolonged, lasting 8–10 days each month, with significant blood loss that can lead to anemia, often accompanied by blood clots and episodes of “flooding,” meaning sudden and unexpected heavy bleeding that is frequently described as if a tap has been turned on.

What are the main causes?

Often, there is no obvious explanation for menorrhagia, and such episodes of bleeding are referred to as “dysfunctional uterine bleeding.” In younger women, menorrhagia is most commonly due to a temporary hormonal imbalance, which usually resolves on its own. As a woman approaches menopause, menorrhagia may again indicate a hormonal disturbance. However, the likelihood that it is caused by another underlying condition increases with age. Other causes of menorrhagia include fibroids, endometriosis, pelvic inflammatory disease, and endometrial polyps.

What is the appropriate treatment for immediate management?

The management of menorrhagia can be achieved through various methods, ranging from conservative treatment (with hormonal or non-hormonal medications) to different forms of surgical treatment (such as endometrial ablation and hysterectomy).

When a period is considered too heavy

In practice, you have heavy menstrual bleeding when your period stops you from living normally. Typical signs:

• you change a pad or tampon every one to two hours, for several hours in a row,
• you need double protection or wake up at night to change,
• you pass clots larger than a two-euro coin,
• the bleeding lasts more than seven days,
• you feel tired, dizzy or short of breath, symptoms that point to anemia.

If you recognize two or more of these, it is worth getting checked. For what is normal, see the article on the menstrual cycle.

How the diagnosis is made

• Medical history and gynecological examination. A period diary kept for two to three months helps a lot.
• Complete blood count and ferritin, to show whether there is anemia or iron deficiency.
• Thyroid and clotting tests, especially when heavy bleeding has been present since adolescence.
• Transvaginal ultrasound, which shows fibroids, uterine polyps and adenomyosis.
• Hysteroscopy with endometrial biopsy, mainly in women over 45 or when treatment is not working.

Treatment options in detail

Medication protocol

• Tranexamic acid: taken only on the days of your period, it reduces blood loss by about half.
• Anti-inflammatory drugs: they reduce the flow and relieve period pain.
• Levonorgestrel intrauterine device (hormonal IUD): the most effective conservative option, reducing flow by more than 90% within a year.
• Combined birth control pills or progestins, which regulate the cycle.
• Iron, when anemia has developed.

Surgical options

When there is an anatomical cause, that cause is treated: hysteroscopic removal of a polyp or a submucosal fibroid, myomectomy. If your family is complete and medication does not help, endometrial ablation is considered and, as a last resort, hysterectomy.

When you need urgent examination

• bleeding that soaks more than two pads an hour, for two hours in a row,
• dizziness, rapid heartbeat or feeling faint,
• bleeding when you might be pregnant,
• any bleeding after menopause (see postmenopausal bleeding).

How much blood you really lose: measuring your flow at home

A normal period loses about 30 to 40 ml of blood over the whole cycle. In studies, heavy menstrual bleeding is defined as a loss of more than 80 ml. But nobody measures milliliters in their bathroom. That is why current guidelines, such as those of the UK's NICE, focus on something simpler: how much your period affects your physical, social and emotional life.

There are, however, ways to bring objective information to your appointment:

• Pad and tampon diary: note each day how many pads or tampons you used and how full they were (a little, half, completely). The PBAC chart is based on this approach, and a score above 100 is considered a sign of heavy blood loss.
• Menstrual cup: most have marked measurements and hold about 20 to 30 ml. If you empty it full every two hours or more often, your flow is heavy.
• Phone app: record the days, intensity, clots and symptoms such as fatigue. Three cycles give a clear picture.

Bring these notes to your appointment. Your doctor will understand much faster whether it is heavy menstrual bleeding or a heavy period that is normal for you.

Heavy menstrual bleeding at every age: different causes, different testing

The same heavy period means something different at 15, at 30 and at 48. Age guides the doctor on what to look for first.

Puberty

In the first years after periods begin, cycles are often anovulatory: the endometrium thickens without the regulating effect of progesterone and sheds irregularly and heavily. There is, however, a cause that is often missed. Bleeding disorders, most commonly von Willebrand disease, are found in a significant percentage of teenagers with heavy menstrual bleeding, in some studies up to about one in five. Nosebleeds, easy bruising, prolonged bleeding after a tooth extraction or a similar family history are reasons for blood clotting tests.

Reproductive years

From 20 to 40, anatomical causes dominate: uterine fibroids, endometrial polyps, adenomyosis. Ovulation disorders are also common, for example with polycystic ovaries or thyroid dysfunction. Recent pregnancy, a copper IUD and medications such as anticoagulants are also on the list.

Perimenopause

After 40, hormones fluctuate sharply. Some cycles are anovulatory, with prolonged or very heavy flow. This is common, but at this age the risk of endometrial hyperplasia or cancer also rises. That is why, over 45 or with risk factors such as obesity, diabetes and polycystic ovary syndrome, an endometrial biopsy is often necessary. You will find more about the changes of this stage in the article on perimenopause.

The PALM-COEIN system: how your gynecologist classifies the causes

Internationally, gynecologists use the FIGO PALM-COEIN classification. It is an acronym that works like a checklist, so that no cause is left unexamined. The first part covers changes seen on ultrasound or hysteroscopy, the second covers causes that cannot be seen on imaging.

• P, Polyp: endometrial or cervical polyps.
• A, Adenomyosis: endometrial tissue within the muscular wall of the uterus. It causes heavy and painful periods.
• L, Leiomyoma: fibroids, especially those that bulge into the uterine cavity.
• M, Malignancy: hyperplasia or malignancy.
• C, Coagulopathy: bleeding disorders.
• O, Ovulatory dysfunction: ovulation disorders.
• E, Endometrial: a local disorder in the hemostatic mechanisms of the endometrium itself.
• I, Iatrogenic: medications or devices, such as anticoagulants and the copper IUD.
• N, Not yet classified: rarer causes, such as an isthmocele after a cesarean section.

It is not unusual for two causes to coexist. A woman with a small fibroid in the uterine wall may, for example, bleed mainly because of anovulation. Matching the right cause changes the treatment.

Iron deficiency after heavy menstrual bleeding: how to replenish your iron

Many women arrive at the office with very low ferritin while their hemoglobin is still normal. Iron stores empty first. Fatigue, difficulty concentrating and hair loss often appear before anemia. Ferritin below 30 ng/ml is generally considered a sign of iron deficiency.

Oral supplements

• They are absorbed best on an empty stomach or with a little food, together with a source of vitamin C, such as orange juice.
• Keep at least two hours apart from coffee, tea, dairy products and antacids, because they reduce absorption.
• Studies show that taking iron every other day is absorbed just as well or even better, and is gentler on the stomach.
• Constipation and dark stools are expected side effects.
• Replenishing your stores usually takes at least three months. Do not stop as soon as you feel better.

Intravenous iron

When tablets are not tolerated, when anemia is severe or when surgery is scheduled soon, iron is given intravenously in one or two sessions. Recovery is much faster.

Nutrition

Red meat, liver, seafood, legumes and green leafy vegetables help. But diet alone is rarely enough when the loss continues every month. The real solution is to reduce the flow.

How treatment for heavy menstrual bleeding is chosen: the criteria that matter

There is no single treatment that suits everyone. The choice comes from the answers to a few simple questions:

• Are you planning a pregnancy soon? Then non-hormonal options are preferred, such as tranexamic acid and anti-inflammatory drugs, which are taken only on the days of your period and do not prevent conception.
• Do you also need contraception? The hormonal IUD and contraceptive pills cover both needs.
• Do you have contraindications to estrogen? A history of thrombosis, migraine with aura, smoking after 35 or uncontrolled high blood pressure rule out combined products. The levonorgestrel IUD or progestin-only products are usually safe alternatives.
• Is there an anatomical cause? A polyp or a submucosal fibroid is not treated with pills. It is removed.
• How much does the pain bother you? Anti-inflammatory drugs reduce both the flow and the pain at the same time.
• Have you completed your family? Only then are permanent options discussed, such as endometrial ablation.

For fibroids that cause heavy menstrual bleeding, there are now also newer oral medications that temporarily suppress the hormonal activity of the ovaries, with a small added dose of hormones to protect the bones. Whether they are suitable is assessed individually.

Whatever treatment you start, give it time. It is usually evaluated after three cycles. For the hormonal IUD we wait about six months, because irregular spotting often appears in the first months and fades over time.

Endometrial ablation: what to know before you decide

Ablation destroys the thin inner layer of the uterus with heat, radiofrequency or cold. It is done hysteroscopically or with special devices passed through the cervix, usually as a day procedure and without incisions.

• Who it is for: women with heavy menstrual bleeding without a significant anatomical cause, who do not want another pregnancy and did not improve with medication.
• What results to expect: most women have a significant reduction in flow. Some stop having periods completely, but this is not guaranteed.
• Prerequisite: before the procedure, hyperplasia or malignancy must be ruled out with an endometrial biopsy.
• Pregnancy: after ablation, conception is unlikely but not impossible, and if it happens it is dangerous. Reliable contraception or sterilization is needed.
• Recovery: cramps for one to two days and a watery discharge for a few weeks. Most women return to work within a few days.

Compared with hysterectomy, recovery is much faster. However, some women eventually need a second procedure in the following years, something to discuss with your doctor beforehand.

Practical tips for heavy-flow days

Until treatment takes effect, a few simple steps make a difference in daily life:

• Combine a cup or tampon with period underwear or a night pad, especially at night and on long trips.
• Put a waterproof cover on your mattress. Sleeping without the worry of an “accident” helps more than you might think.
• A higher-absorbency tampon does not mean more hours of use. Change it at least every 4 to 8 hours to lower the risk of toxic shock syndrome.
• For pain, choose ibuprofen or mefenamic acid instead of aspirin, which can increase bleeding.
• Drink plenty of fluids and do not get up suddenly when you feel dizzy.
• Keep a change of clothes in your bag. A small thing, a big sense of security.

Myths and facts about heavy periods

• “All the women in my family have heavy periods, so it is normal.” A family pattern may hide a bleeding disorder or fibroids, which also run in families. It calls for testing, not acceptance.
• “A heavy period cleanses the body.” Periods do not eliminate toxins. Heavy blood loss simply deprives you of iron.
• “An IUD always increases the flow.” That is true for the copper IUD. The hormonal IUD does the opposite and is one of the most effective treatments.
• “The only permanent solution is removing the uterus.” Most women improve with medication or a minor hysteroscopic procedure.
• “After 40, everything is due to menopause.” Hormonal changes explain a lot, but not everything. Any new change in flow at this age should be checked.

Frequently Asked Questions

Does heavy menstrual bleeding cause anemia?

Yes, it is the most common cause of iron deficiency anemia in women of reproductive age. Fatigue, paleness, hair loss and getting easily short of breath are the usual signs.

Are blood clots during a period normal?

Small clots on heavy-flow days are common. Clots larger than about 2.5 centimeters, or many in every cycle, need to be checked.

Can heavy menstrual bleeding affect fertility?

The bleeding itself does not, but its causes can: submucosal fibroids, polyps and ovulation disorders make conception harder and can be treated.

What is the difference between menorrhagia and metrorrhagia?

Menorrhagia is excessive bleeding during your period. Metrorrhagia is bleeding outside your period, between two cycles.

When should I see a doctor for a heavy period?

When your period lasts more than seven days, when you change protection every one to two hours, or when fatigue affects your daily life.

Can a copper IUD increase menstrual flow?

Yes. The copper IUD often increases the length and amount of your period, mainly in the first months after insertion. If the flow exhausts you or causes anemia, talk with your doctor about switching to a levonorgestrel IUD, which significantly reduces bleeding.

Can heavy menstrual bleeding be a sign of cancer?

Rarely, and mainly in women over 45 or with risk factors such as obesity, diabetes and polycystic ovary syndrome. That is why an endometrial biopsy is done in these cases. In younger women the cause is almost always benign.

Why did my period get heavier after stopping the birth control pill?

The pill thins the endometrium and makes your period lighter. When you stop it, your natural cycle returns, which may always have been heavier. If the flow remains heavy after three cycles, you need a gynecological assessment.

Can I reduce my menstrual flow through diet?

No diet cures heavy menstrual bleeding. A diet rich in iron and vitamin C, however, helps replace losses and prevent anemia. When obesity is present, weight loss helps regulate ovulation and often improves the cycle.