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Why is my period so heavy?

Updated Sep 3, 20261 min readAnswer
On this pageShort answer What to do Common questions Related questions Sources
Short answer

Soaking through hourly, large clots, or 7+ days is heavy bleeding - the top cause of iron-deficiency anemia in women. Fibroids, hormone imbalance, thyroid, and bleeding disorders are the causes; treatment works.

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What to do

1Measure it objectively- hourly soaking or large clots is the threshold, per womenshealth.gov.
2Track pad counts for a cycle- numbers beat descriptions at the doctor.
3Get bloodwork and an exam- anemia, thyroid, ultrasound.
4Note lifelong heaviness plus bruising- the bleeding-disorder clue worth naming.

Common questions

Why is my period so heavy?

Heavy periods have a working definition: soaking a pad or tampon every hour for several hours, passing clots larger than a quarter, bleeding past seven days, or bleeding that disrupts sleep and life. If that is you, it deserves attention - heavy menstrual bleeding is common, but it is also the leading cause of iron-deficiency anemia in women, and womenshealth.gov notes anemia brings fatigue, weakness, and shortness of breath on top of the bleeding itself. The cause list: hormone imbalance - especially in teens and perimenopause, when ovulation gets erratic - fibroids, which are benign uterine growths and the most common structural cause; polyps; adenomyosis; an underactive thyroid; bleeding disorders, which are underdiagnosed - a heavy period since the very first one plus easy bruising or nosebleeds is the clue; and sometimes no clear cause at all. The practical path: track flow for a cycle or two - pad counts beat vague descriptions - and get checked: an exam, blood count for anemia, thyroid test, and often an ultrasound. Treatment works: hormonal options, tranexamic acid for the bleeding days, iron for the anemia, and procedures for fibroids when needed. Nobody should plan their life around a bathroom map. Pymander is a free AI doctor, 24/7 by text. Describe your flow, and it can help you prep for the visit.

About this page. Written and maintained by the Pymander Health team. Last updated September 3, 2026.

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