Heavy periods: how heavy is too heavy, and what lightens them

The medical threshold is 80ml per cycle, but nobody measures at home, so the practical definition rules: soaking through a pad or tampon every one to two hours for several hours, needing double protection, night-time changes, clots larger than a 50p coin, bleeding beyond seven days, or any bleeding that restricts your life. If you plan your schedule, your clothing, or your sleep around your period, it qualifies as heavy and is worth treating, regardless of volume.

Yes, and it is extremely common: heavy menstrual bleeding is the leading cause of iron-deficiency anemia in premenopausal women. The signs are exhaustion out of proportion, breathlessness on exertion, pale skin, headaches, and craving ice or non-food items. A simple blood test (hemoglobin and ferritin) confirms it; iron supplements restore stores over a few months. Treating the bleeding and the iron together matters: topping up iron while the tap runs is a treadmill.

Tranexamic acid is a tablet taken only during the period (typically three to four days) that stabilizes clots in the womb lining, reducing flow by roughly half. It is not a hormone, does not affect fertility, and has been used for decades. It is unsuitable with a history of blood clots. Because it works only during bleeding days, it is often the first thing tried: no procedure, no hormones, immediate effect, reversible. It pairs well with ibuprofen, which adds a further reduction.

Because it is the single most effective medical treatment for heavy periods: the levonorgestrel IUS (Mirena-type) thins the womb lining, and most users end up with light spotting or no periods at all, with contraception included for five-plus years. The trade-offs: irregular spotting in the first three to six months, and the fitting appointment itself. For anyone finished with pregnancies or wanting long contraception, guidelines place it above tablets. For those wanting pregnancy soon, tranexamic acid plus ibuprofen is the interim answer.

Fibroids are benign muscle growths of the womb, very common (most women have some by 50) and a leading cause of heavy periods, especially with a bulky-feeling pelvis or pressure on the bladder. An ultrasound finds them reliably. Most need no action; when they drive heavy bleeding, options range from the same tablets and the IUS, through fibroid-shrinking medication, to procedures (removal, artery embolization, or ablation). The diagnosis changes the menu, not the urgency: fibroids are essentially never cancer.

Possibly, and it is under-diagnosed: a meaningful minority of women with lifelong heavy periods have an underlying bleeding disorder, most often von Willebrand disease. Clues: heavy bleeding since the very first periods, easy bruising, frequent nosebleeds, bleeding after dental work or surgery, and family members with the same. A specific blood panel checks for it. It matters beyond periods: it changes how surgery, dental extractions, and childbirth are managed safely.