What are the potential causes of heavy periods?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Heavy menstrual bleeding (menorrhagia) is most often caused by three main factors: hormonal imbalances that disrupt the regulation of your menstrual cycle, bleeding disorders that affect how your blood clots, or structural problems in the uterus such as fibroids or polyps. Identifying the underlying cause is essential for effective treatment.

Because heavy periods can stem from many overlapping conditions, self-diagnosis is difficult and often inaccurate. A free, instant, online symptom check can help you quickly narrow down potential causes based on your specific symptoms, guide you on whether to see a doctor, and help you feel more prepared for that conversation. Taking a few minutes now could save you weeks of uncertainty—and get you closer to relief.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Discover what’s causing heavy periods Find out if your bleeding needs care See if it could be a serious issue Find OTC relief for heavy periods Find a doctor for heavy periods Learn home remedies for heavy periods Understand if heavy periods need a symptom check

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Explanation

Heavy periods, also known as heavy menstrual bleeding, can have several causes.

Hormonal Imbalances: Sometimes, the body makes too much or too little of certain hormones that control the menstrual cycle. This can lead to heavy bleeding.

Bleeding Disorders: Some people have bleeding disorders that make them bleed more easily. This means they might have heavier periods.

Structural Problems: There could be issues like fibroids or polyps in the uterus that cause heavy bleeding. Endometriosis can also cause heavy periods.

In adolescents, heavy periods might be normal as their bodies are still adjusting, but it can also be a sign of a bleeding disorder. If heavy periods are causing problems, like making someone feel very tired or weak, take a free symptom checker test to help understand your symptoms and determine when to seek medical care.

(References)

James AH. (2016). Heavy menstrual bleeding: work-up and management. Hematology. American Society of Hematology. Education Program, 27913486.
Luiro K, & Holopainen E. (2022). Heavy Menstrual Bleeding in Adolescent: Normal or a Sign .... Seminars in reproductive medicine, 34734398.
Djambas Khayat C, Gouider E, von Mackensen S, & Abdul Kadir R. (2020). Heavy menstrual bleeding in women with inherited .... Haemophilia : the official journal of the World Federation of Hemophilia, 32356352.

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