menorrhagia
Meaning of menorrhagia: Bleeding heavy enough to disrupt daily life often traces to fibroids, hormone shifts or an inherited clotting problem, and steadily drains iron.
Definition of menorrhagia
Menorrhagia is menstrual bleeding that is abnormally heavy, abnormally prolonged, or both, judged against what is usual for that person. It shows as soaking through protection far more often than expected, passing large clots, or bleeding well past the usual number of days. The word names the bleeding pattern only and carries no statement about its cause.
What causes heavy periods?
| Group | Examples |
|---|---|
| Structural | Fibroids, polyps, adenomyosis, thickening or cancer of the uterine lining |
| Hormonal | Cycles in which no egg is released, thyroid disease, polycystic ovary syndrome |
| Bleeding and clotting | Inherited clotting disorders, low platelets, anticoagulant medicines |
| No cause found | Heavy bleeding with a normal uterus and normal test results |
The grouping matters because each group is investigated differently. Structural causes are found by looking at the uterus, hormonal causes by testing the blood, and clotting disorders by asking about a lifetime of easy bruising, nosebleeds and prolonged bleeding after dental work or childbirth. Von Willebrand disease is the inherited clotting problem most often uncovered in this setting, and it is frequently missed for years because heavy periods are assumed to be normal. A substantial share of cases end with no structural or hormonal explanation at all, which is a recognized outcome rather than a failed search.
Why does it lead to iron deficiency?
Iron leaves the body with the blood. Loss that runs ahead of what the diet replaces empties the body's iron stores first, and only later does the hemoglobin fall far enough to register as anemia. That order explains a familiar pattern: tiredness, breathlessness on stairs, brittle nails and poor concentration can all appear while a routine blood count still reads as normal, because stored iron is measured by a separate test. Heavy bleeding month after month is one of the commonest reasons for iron deficiency in menstruating adults.
How is the bleeding assessed?
There is no bedside instrument for it, so assessment rests on description: how many days of bleeding, how often protection is changed, whether clots pass, whether bleeding soaks through at night, and whether the pattern has shifted across recent turns of the menstrual cycle. A laboratory test panel usually covers a blood count, iron stores and thyroid function, with clotting studies added when the history points that way. Imaging of the uterus, usually by ultrasound, looks for fibroids, polyps and thickening of the lining, and a sample of the lining is taken when that thickening or the person's age raises concern about cancer. Terminology has moved on: international classification now prefers heavy menstrual bleeding, defined by its effect on the person rather than by a fixed volume, and menorrhagia survives mainly in older records and everyday speech.
Also known as
Used in a sentence
The patient was referred for evaluation of menorrhagia after reporting several months of unusually heavy periods.
Good to know
Menorrhagia refers specifically to heavy or prolonged bleeding during a period, which is distinct from bleeding between periods, called intermenstrual bleeding, and from bleeding after menopause, which is investigated differently again.
Word origin
Where “menorrhagia” comes from
Formed from meno-, from Greek men, meaning month, and -rrhagia, from Greek rhegnynai, meaning to burst forth.