Medically reviewed guide · Last updated: 1 August 2026 · Reading time: approx. 8 min

Heavy Periods: When Is It Too Much — and What Helps?

The most common causes compared

When is bleeding really too heavy?

Textbooks give an amount of blood in millilitres — useless day to day, because nobody collects their period and measures it. Practices therefore work with features you can observe yourself:

• Changing every hour for several hours — a pad or tampon in the largest size does not last an hour, and that several times in a row.
• Bleeding lasting longer than seven days — prolonged counts just as much as very heavy.
• Large clots from roughly the size of a coin, bleeding through at night, or constantly doubling up with a tampon and a pad.
• Restrictions in everyday life: if you plan sport, work and social arrangements around your cycle, that is the most important finding of all.

The change matters too: bleeding that has been heavy since your first period points in a different direction from bleeding that becomes heavy for the first time in your mid-40s.

The causes in detail

Fibroids: the most common structural cause

Fibroids are benign muscle growths in the wall of the womb. Whether they cause symptoms depends less on their size than on where they sit: growths that project into the cavity of the womb enlarge the bleeding surface and interfere with the muscle contracting — the bleeding becomes heavy and long. Fibroids on the outside can be large and cause hardly any bleeding. Typical companions are pressure on the bladder and dull abdominal pain. An ultrasound clarifies this in a few minutes.

Adenomyosis: the twin that is often overlooked

Here tissue similar to the lining of the womb grows into the muscular wall, which becomes evenly larger, softer and tender to pressure as a result. Typical is the combination of heavy bleeding and pronounced cramping, often after pregnancies. Because no single growth can be seen on ultrasound, adenomyosis is missed more easily than a fibroid — it is worth asking about.

Endometriosis and the copper coil

In endometriosis, tissue similar to the lining of the womb settles outside the womb. Pain is at the forefront, but many people also report heavier or longer bleeding. If pain during sex, when opening your bowels or when passing urine comes on top of that, it belongs in the conversation together.

A copper coil makes bleeding heavier and longer for many people — a known property of the method, not a sign that something has gone wrong; hormonal coils work the other way round. If your bleeding only became heavy after it was fitted, the method is a good topic for discussion; see also medications and contraception.

Hormonal disorders: PCOS and the thyroid

If no ovulation takes place, the second half of the cycle with its progesterone is missing — the lining keeps building up and at some point comes away in a disorderly, heavy fashion. That is exactly what typically happens with PCOS: long gaps, then very heavy bleeding.

Considerably less often thought of, but readily treatable: an underactive thyroid. It interferes with the control of the cycle, can make bleeding heavier and longer — and often brings along exactly the accompanying symptoms that also fit iron deficiency: fatigue, feeling cold, weight gain. A TSH level is quickly measured and belongs in the work-up for unexplained heavy bleeding.

Bleeding disorders: the diagnosis that takes decades

If your bleeding has been heavy since your very first period, it is worth thinking about an inherited bleeding disorder — above all von Willebrand disease, the most common inherited bleeding disorder there is. In women it often goes unrecognised for decades, because a heavy period is dismissed as a family trait while the actual cause lies in the blood.

The menopausal transition: irregular is normal, afterwards it is not

In the years before your last period, hormone levels fluctuate considerably. Cycles without ovulation become more frequent, bleeding becomes irregular, sometimes it is absent, sometimes surprisingly heavy. That is part of the menopause and is not in itself an alarm signal — newly heavy bleeding at this age is still investigated, because fibroids and changes in the lining of the womb also become more common.

The consequence that is missed most often: iron deficiency

Every period costs iron. With heavy bleeding month after month, what you take in through food eventually no longer covers that loss. The stores empty first — measurable as ferritin — and only considerably later does the haemoglobin level fall. That is why you can feel exhausted while “the blood count was fine”: anyone who only looks at the haemoglobin does not see the empty store.

Typical signs of iron deficiency and of the iron-deficiency anaemia that develops from it: persistent fatigue that does not go away even after sleep; pallor; shortness of breath on exertion and palpitations with only slight effort; plus difficulty concentrating, hair loss, brittle nails and restless legs at night.

If a deficiency is confirmed, the practice usually treats it with iron supplements. Two points are decisive: the stores fill slowly, which is why you usually keep taking them for months, even if you feel better sooner. And absorption depends on how you take them — a gap from coffee, tea, dairy products and acid blockers improves it considerably; details in the guide iron deficiency. As long as the bleeding stays heavy, though, iron is only the repair job.

Self-tests: first clues at home

These observations do not replace a diagnosis. But they turn a vague “it is quite a lot” into a finding a practice can work with.

• Count your products over two cycles: note down per day how many pads, tampons or cup emptyings add up — and how full they were.
• The iron check: are you more breathless climbing stairs than you were a year ago, are you paler? Both belong in the laboratory.
• Your life story: was the bleeding already heavy at your very first period, or has it only become so? This question steers the work-up in quite different directions.

Warning signs: when not to wait

• Soaking through a pad and your clothes within an hour, several hours in a row
• Dizziness on standing up, a racing heart, cold sweats or fainting during the bleeding
• Any bleeding that occurs more than twelve months after your last period
• Heavy bleeding during a possible or known pregnancy
• Bleeding with fever, severe pain or foul-smelling discharge
• New bleeding between periods or after sex
• Increasing exhaustion and breathlessness over weeks

The treatment pathway: step by step

Usually two things run in parallel: looking for the cause while treating the bleeding and its consequences. The choice of treatment is always made by the practice treating you, partly depending on whether a pregnancy is planned.

1. Document. Two cycles with bleeding days, changes of pad, clots and accompanying symptoms — the basis of any sensible conversation.
2. Basic work-up. A conversation, a gynaecological examination, an ultrasound, plus a blood count and ferritin. If there is a suspicion, thyroid levels, a hormone profile or clotting tests are added.
3. Refill your iron stores — regardless of how much longer the search for the cause takes.
4. Reduce the bleeding with medication. Without surgery there are two established routes: anti-inflammatory painkillers during the bleeding days, and tranexamic acid, which inhibits the premature breakdown of blood clots in the lining of the womb. Both belong under medical supervision.
5. Discuss hormonal options. For heavy bleeding when you are not trying to conceive, the hormonal coil counts as one of the most effective options. The pill or progestogen-only preparations are also possible — each with its own pros and cons.
6. Procedures as a later step. With fibroids, or with persistently heavy bleeding despite medication, there are womb-preserving techniques through to larger operations.

The medication angle: what makes it heavier, what makes it lighter

What makes the bleeding heavier

Anticoagulants are the most important group. Phenprocoumon and the direct oral anticoagulants rivaroxaban and apixaban can make periods considerably heavier and longer; aspirin also inhibits the platelets. In younger women on long-term anticoagulation, a heavy period is a common but rarely raised problem. A copper coil, stopping hormonal contraception and individual herbal preparations can also make bleeding heavier.

What reduces the bleeding, surprisingly

With heavy periods, anti-inflammatory painkillers act on the amount of blood lost as well: they inhibit the prostaglandins, which in the lining of the womb also control blood flow. Ibuprofen and naproxen can measurably lower how heavy the bleeding is when they are taken regularly rather than sporadically during the bleeding days — within the limits given by your doctor or the patient information leaflet. For many people this is the most useful piece of information in this article, because one medicine addresses pain and bleeding at once. Tranexamic acid and the hormonal coil, which keeps the lining of the womb thin, also reduce bleeding — both on prescription only.

How to prevent the consequences of heavy bleeding

How heavy the bleeding is cannot be steered by lifestyle — anyone who promises that is promising too much. You can prevent the consequences, though, and iron deficiency above all.

• Have your ferritin checked regularly — with persistently heavy bleeding, an annual look at your iron stores makes sense, not only once you are exhausted.
• Finish a course of iron treatment — once the haemoglobin has been topped up, the store still takes longer. Stopping early is the most common reason for a relapse.
• Start painkillers early and take them regularly — if you only start on the second day, you give away the bleeding-reducing effect of those first hours.
• Keep all your medicines in one place — anticoagulants, painkillers, hormones and supplements in one list, so that interactions stand out before they show up as bleeding.

Bleeding, iron and medicines in view — with brite

A bleeding diary, a record of what you take and an interaction check in one place. Free of charge.

Start free now