Very heavy periods: this is not just your age

What you will understand

A bath towel under the sheets, the light-colored clothes you no longer wear, the toilets you locate before going out: when you talk about it, you are told that it is normal, at your age. Common, yes. Normal is another word. And common means neither that there is nothing to do, nor that there is nothing to look at. First point to state: there is no threshold you have to reach to be entitled to talk about it. Heavy periods were long defined by a volume measured in a laboratory, eighty milliliters per cycle, which nobody measures in real life. The international classification gynecologists use today is fairer: periods are heavy when the blood loss interferes with your physical, social, emotional or material life (PMID 30198563). What you feel is not beside the diagnosis, it is part of it.

You are not an exception either. A large American study followed one thousand three hundred and twenty women for ten years, having them fill in a calendar of their periods day after day throughout their crossing of menopause, in four groups of different backgrounds. Among these women, about three in four experienced, at least three times, periods lasting ten days or more, and one in three experienced, at least three times, bleeding they themselves described as heavy for three days in a row (PMID 24735184). These are not figures that apply automatically to you: they are those women, followed through their perimenopause. But they say that the phenomenon is massive, and yet silent.

The answer heard everywhere, the one that says your hormones are dropping, is wrong for heavy periods. If estrogen collapsed, the endometrium, the lining of the inside of the uterus, would become thin, and a thin endometrium bleeds little. An Australian team did something rare: drawing blood three times a week over a whole cycle, in women classified according to their exact stage of ovarian aging. In cycles with ovulation, estrogen does not fall as the transition advances, it rises. What falls is the progesterone of the second half of the cycle, and above all the cycles without ovulation multiply: in the most advanced group, nearly four cycles out of ten went by without any ovulation (PMID 17550960). Yet progesterone is the brake, the one that stops the building of the endometrium and organizes its shedding on schedule. No ovulation, no progesterone, no brake: the lining thickens without instruction, until it comes away any way it likes and at any time.

That said, "it is hormonal" is only one possible explanation among several. The common framework used by gynecologists around the world separates two families of causes. On one side, what can be seen on ultrasound: a polyp, adenomyosis, a fibroid, an endometrial lesion. On the other, what cannot be seen: a clotting disorder sometimes known since adolescence, a disturbance of ovulation, a problem of the endometrium itself, or the effect of a medication already being taken. The two families can coexist in the same woman. Fibroids are the best illustration: an American study gave an ultrasound to women aged thirty-five to forty-nine, whether or not they had any complaint, and adding up to age fifty, more than eight Black women out of ten and nearly seven white women out of ten develop at least one, most often with no symptom at all (PMID 12548202). Finding a fibroid is therefore not the same as having found the cause, and if a treatment changes nothing about the bleeding, the question has to be reopened.

Then comes what is almost always forgotten: iron. Fatigue, breathlessness on a flight of stairs, feeling cold all the time, hair falling out, difficult concentration, legs that will not stay still in bed at night, all of it is put down to menopause, which explains everything and therefore explains nothing. Yet bleeding heavily, every month, for months, means losing iron, and iron deficiency gives exactly these symptoms. The trap is that you can be short of iron well before being anemic: a blood test with a normal hemoglobin does not tell you that your stores are full. What you need to ask for is ferritin, which measures the stock. If only one thing were to be remembered from this video, it would be that one: when periods are heavy, ferritin gets measured.

The video then details what cannot wait, then why the endometrium is examined from the age of forty-five, and finally what really works. On this last point, the good news is substantial: a team took all the available trials and compared them with one another, and one treatment comes out consistently at the top for first-line use (PMID 35638592). It is neither surgery nor the pill: it is the intrauterine device that releases a progestogen directly into the uterus. An English trial tested it in general practice in five hundred and seventy-one women aged twenty-five to fifty, randomly assigned between that device and the usual treatments: at two years, the device had improved their quality of life more (PMID 23301731); at five years, both groups were doing clearly better than at the start and the gap between them had narrowed to the point of no longer being significant (PMID 27884916). For those who do not want hormones, tranexamic acid, taken only on bleeding days, reduced blood loss by about forty percent in a placebo-controlled trial where it was measured (PMID 20859150). These choices are to be discussed with a doctor: they are options, not a prescription.

The key points to remember

• Periods are heavy when the blood loss interferes with your physical, social, emotional or material life: that is the international definition, and what you feel is part of the diagnosis.
• It is not your estrogen that collapses: it is ovulation that becomes irregular and progesterone that no longer applies the brake to the endometrium.
• In one thousand three hundred and twenty women followed for ten years, about three in four experienced at least three times periods of ten days or more, and one in three heavy bleeding for three days in a row.
• Finding a fibroid is not having found the cause: most fibroids cause no symptom at all, and a disturbance of ovulation can be hiding behind it.
• When periods are heavy, ferritin gets measured: you can be short of iron well before being anemic, and a normal hemoglobin says nothing about your stores.
• See a doctor without delay if you soak through a pad completely in one hour for several hours in a row, if you regularly pass clots larger than a coin, if you bleed between periods or after intercourse, or if your periods last more than seven days cycle after cycle.
• The progestogen intrauterine device comes out at the top of first-line treatments, and tranexamic acid reduces blood loss by about forty percent: effective treatments exist well before surgery.

Video chapters

1. 0:00 Common does not mean normal
2. 0:47 What "heavy periods" really means
3. 1:43 One thousand three hundred and twenty women followed for ten years
4. 2:33 Why now: it is not a lack of estrogen
5. 3:24 Progesterone, the brake that disappears
6. 4:24 The other possible causes, and the fibroid trap
7. 6:13 Iron: the test everyone forgets
8. 7:11 What cannot wait, and when to call emergency services
9. 8:12 From the age of forty-five: looking at the endometrium
10. 9:04 What really works: the IUD, tranexamic acid
11. 10:57 Two traps: surgery straight away, and the internet
12. 11:48 Recap

The scientific sources cited

Every claim in this video rests on a verified reference. Here is the complete list, with the PubMed links.

• Munro MG, et al. FIGO systems for AUB, 2018 revisions. Int J Gynaecol Obstet. 2018. PubMed 30198563
• Harlow SD, et al. STRAW + 10 executive summary. J Clin Endocrinol Metab. 2012. PubMed 22344196
• Paramsothy P, et al. Bleeding patterns during the menopausal transition (SWAN). BJOG. 2014. PubMed 24735184
• Hale GE, et al. Endocrine features of menstrual cycles across STRAW stages. J Clin Endocrinol Metab. 2007. PubMed 17550960
• Baird DD, et al. High cumulative incidence of uterine leiomyoma. Am J Obstet Gynecol. 2003. PubMed 12548202
• Clarke MA, et al. Risk assessment of endometrial cancer in women with abnormal bleeding. Am J Obstet Gynecol. 2020. PubMed 32268124
• Bofill Rodriguez M, et al. Interventions for heavy menstrual bleeding: network meta-analysis. Cochrane Database Syst Rev. 2022. PubMed 35638592
• Gupta J, et al. Levonorgestrel intrauterine system versus medical therapy for menorrhagia (ECLIPSE). N Engl J Med. 2013. PubMed 23301731
• Kai J, et al. ECLIPSE long-term randomised pragmatic trial in primary care. Br J Gen Pract. 2016. PubMed 27884916
• Lukes AS, et al. Tranexamic acid treatment for heavy menstrual bleeding: RCT. Obstet Gynecol. 2010. PubMed 20859150

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