What are the underlying causes of heavy periods?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Heavy menstrual bleeding (menorrhagia) can result from several factors, including:

Hormonal imbalances affecting estrogen and progesterone levels
Uterine fibroids or polyps
Stress and lifestyle factors
Underlying health conditions such as thyroid disorders, bleeding disorders, or endometriosis

If your periods soak through pads or tampons every hour, last longer than 7 days, or interfere with daily life, it's important to speak with a healthcare provider.

Not sure whether your symptoms warrant a doctor's visit? Understanding the potential cause of heavy bleeding is the first step toward relief — and you don't need to wait weeks for an appointment to start. Take a free, instant, AI-powered symptom check to get personalized insights about what may be causing your heavy periods and clear guidance on your next steps.

Reviewed for medical accuracy: 07/15/2026

Quick answers

Frequently Asked Questions

4 answers

The most common questions people search after this page

Concerned about your symptoms?

Start a symptom check

Explanation

Heavy periods, also known as heavy menstrual bleeding, can be caused by a variety of factors. One common cause is hormonal changes, especially during adolescence when the body is still adjusting to new hormone levels.

Another possible cause of heavy periods is uterine fibroids. These are non-cancerous growths in the uterus that can lead to increased menstrual bleeding.

Additionally, other health conditions can also lead to heavy periods. These can include thyroid abnormalities, issues with blood clotting or certain medications that affect hormone levels.

If you experience heavy periods, it's important to talk to a healthcare provider. To help identify what might be causing your symptoms, you can start by taking this free symptom checker test before your appointment.

(References)

Luiro K, & Holopainen E. (2022). Heavy Menstrual Bleeding in Adolescent: Normal or a Sign .... Seminars in reproductive medicine, 34734398.
Brenner PF. (1996). Differential diagnosis of abnormal uterine bleeding. American journal of obstetrics and gynecology, 8828559.
Uimari O, Subramaniam KS, Vollenhoven B, & Tapmeier TT. (2022). Uterine Fibroids (Leiomyomata) and Heavy Menstrual .... Frontiers in reproductive health, 36303616.

Tell your friends about us.

We would love to help them too.

For First Time Users

What is Ubie’s Doctor’s Note?

We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.

Was this page helpful?

Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.