Heavy Periods: Causes and When to Worry

The short answer: Your period is too heavy if you are changing a pad every 1 to 2 hours, using two pads together, bleeding for more than 7 days, passing clots bigger than about 2.5 cm, staining your clothes or bedding, or feeling tired and breathless. There is no measuring cup for this. If the bleeding is too much for your life, that counts as heavy, and it is worth checking. The single most important test is a simple blood count, because heavy periods quietly drain your iron.

Are my periods actually too heavy?

Most women have no idea, because you can only compare with your own past periods. Nobody discusses this. So use these signs, which are the ones we use in clinic.

These are the signs the NHS lists for heavy periods, and the US Office on Women's Health lists much the same. If two or more sound like you, this article is for you.

What about the "80 ml" rule?

You will read that a heavy period means losing more than 80 ml of blood. That is a research definition, used in studies where blood loss is measured in a laboratory. You cannot measure it at home, and no clinic in Hubli is going to weigh your pads.

This is why the modern approach dropped it. NICE, the UK national guidance that Indian practice broadly follows, does not use a millilitre cut-off at all. Periods vary widely between women. Bleeding counts as heavy when it is outside your normal and it disrupts your life.

I find that freeing, and I want you to hear it clearly: you do not need to prove your bleeding is heavy enough to deserve help. If it is ruling your month, that is reason enough to come.

What causes heavy periods?

Doctors sort the causes into two groups: changes in the structure of the womb, which show up on a scan or in a tissue sample, and everything else, which does not. It is a useful way to think, because it explains why one woman gets an ultrasound and another gets a blood test. Gynaecologists call this the PALM-COEIN system.

Two of these deserve a closer look, because they are the ones I see most.

Fibroids

Fibroids are non-cancerous growths in the muscle of the womb. They are common. In a hospital study of women attending a gynaecology outpatient department in eastern India, about 1 in 5 of those women had fibroids, most often between 30 and 39. Women who come to a gynaecology clinic are more likely to have fibroids than women in general, so read that as a clinic figure, not a population rate. The same study found higher rates in women who were overweight, and lower rates in women with a normal body weight.

Fibroids do not always cause symptoms. When they do, heavy bleeding is the classic one, sometimes with a feeling of pressure or a heaviness low in the belly. Size and position matter more than number, which is why the scan report is worth discussing rather than just filing away.

Hormonal causes and PCOS

When ovulation does not happen regularly, the lining of the womb keeps building up without the monthly hormone signal that normally sheds it neatly. It then comes away heavily and unpredictably. This is why PCOS and heavy or irregular bleeding travel together so often. My PCOS guide covers that side, and my guide to irregular periods works through the full list of cycle causes.

The one many women miss: a bleeding disorder

If your periods have been heavy from the very first one AND you also bruise easily, bleed a long time from small cuts, or have a family member with the same story, that combination matters. NICE advises testing for a clotting problem such as von Willebrand disease when both parts are present. It is under-recognised in India and it changes treatment completely, so please mention it.

Why heavy periods matter more in India

Because of iron. Every heavy period takes iron out of your body, and Indian women start from a low base. In the National Family Health Survey of 2019 to 2021, the most recent completed round, 57% of Indian women aged 15 to 49 were anaemic, up from 53% five years earlier.

Anaemia is what turns a heavy period from an inconvenience into something that steals your energy all month. The tiredness, the breathlessness on stairs, the hair fall, the poor concentration: women blame themselves for these, when the cause is sitting in plain sight every month.

This is why the NICE guideline says to do a full blood count for every woman with heavy periods, alongside starting treatment. Not instead of treatment. Alongside. If your iron is low, my guide to iron deficiency and the Indian diet is the next thing to read.

Which tests do I actually need?

• A full blood count, for everyone. This checks haemoglobin and tells us if you are anaemic. Non-pregnant women are anaemic below 12.0 g/dl.
• A pelvic ultrasound, if there are clues. Pressure symptoms, an enlarged womb on examination, or a suspected fibroid or adenomyosis. Not everyone needs a scan.
• A camera test of the womb lining (hysteroscopy), sometimes with a small tissue sample. This is the better test when you bleed between periods, bleed after sex, or have risk factors for a problem in the lining. A scan alone can miss a polyp, and only a tissue sample can rule out cancer.
• Clotting tests, if you have bled heavily since your very first period AND you or your family have a history that suggests a bleeding problem. NICE asks for both together, not either one alone.

The test you probably do not need

A thyroid test. This surprises women, because heavy periods and thyroid problems are linked in everything you read online. But NICE is specific: do not do thyroid testing for heavy bleeding unless there are other signs and symptoms of thyroid disease as well.

So if you also have the cold, the tiredness, the weight change, the neck swelling, then yes, we test. If heavy bleeding is your only symptom, that test is unlikely to explain it, and the money is better spent on the blood count and the scan. My thyroid guide lists the signs that would justify testing.

What to do first, before you even see a doctor

Two simple things make your appointment far more useful.

Track one full cycle. Note the days you bleed, how many pads you use on the worst day, whether clots appear, and how you felt. A photo of a written note on your phone is enough. This turns "my periods are heavy" into something we can actually work with.

Do not start iron tablets and stop there. Iron treats the consequence, not the cause. Take it if your doctor advises, but keep the appointment about why the bleeding is happening.

Once we know the cause, there is a clear ladder of treatments, starting with the hormone-releasing IUD and the non-hormonal tablets, and moving to procedures only if those do not work. I go through every option, how well each one works and who it suits, in my guide to heavy period treatment options.

Your questions, answered

How many pads a day is too many?

There is no official pad count, but needing a change every 1 to 2 hours through the day is the practical sign of heavy bleeding. What matters as much is whether you are soaking through, doubling up, or waking at night to change.

Are clots in period blood normal?

Small clots are common and not worrying. Clots larger than about 2.5 cm, roughly a ten-rupee coin, count as a sign of heavy bleeding and are worth mentioning to your doctor.

Can stress cause heavy periods?

Stress can disturb ovulation, and disturbed ovulation can make bleeding heavier and less predictable. But stress is rarely the whole story, so it should not be the reason to skip a check-up. My guide to managing stress covers the hormone side.

My mother and sister also had heavy periods. Is it just our family?

It may run in the family, and that is exactly why it is worth checking rather than accepting. Inherited bleeding disorders and fibroids both cluster in families, and both are treatable. Family history is a reason to test, not a reason to endure.

Will my heavy periods stop after marriage or a baby?

No, this is a myth I hear often. Bleeding may change after childbirth, sometimes lighter and sometimes heavier, but nothing about marriage treats a fibroid, a hormone problem or a clotting disorder.

Is it dangerous to lose this much blood every month?

Repeated heavy periods usually cause harm slowly, by draining your iron. But bleeding can be dangerous right now if you are soaking a pad every hour for more than two hours, feel faint or breathless, have chest pain or severe pain, or could be pregnant. In those situations, get emergency care the same day. Otherwise, the blood count is what tells us how much the monthly loss has cost you.

Sources for this article (7)

1. NICE guideline NG88, Heavy menstrual bleeding: assessment and management (accessed July 2026)
2. NHS, Heavy periods (accessed July 2026)
3. US Office on Women's Health, Period problems (accessed July 2026)
4. Munro MG et al., The two FIGO systems for normal and abnormal uterine bleeding: 2018 revisions, International Journal of Gynecology and Obstetrics (accessed July 2026)
5. Prevalence and determinants of anaemia among women of reproductive age in India: analysis of NFHS-4 and NFHS-5 data, BMC Public Health, 2024 (accessed July 2026)
6. Predictors and symptomatic burden of uterine fibroids among women in south-eastern India, International Journal of Reproduction, Contraception, Obstetrics and Gynecology (accessed July 2026)
7. Kocaoz S et al., Prevalence and impact of heavy menstrual bleeding on anaemia, fatigue and quality of life, Pakistan Journal of Medical Sciences, 2019 (accessed July 2026)

This article is for your information and learning. It is not a substitute for a consultation. For advice about your own health, talk to me or your own doctor.