What could cause heavy periods with clots after age 40?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Heavy periods with clots after age 40 are often caused by hormonal shifts related to perimenopause, uterine conditions such as fibroids, polyps, or adenomyosis, and less commonly by bleeding disorders or thyroid dysfunction. As estrogen and progesterone levels fluctuate with age, the uterine lining can thicken unevenly, leading to heavier flow and larger clots during menstruation.

Because these symptoms can point to several different underlying conditions—some benign and some requiring prompt care—it's important to identify possible causes early. Take a free, instant, online symptom check to better understand what may be driving your symptoms and confidently plan 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 with clots, also known as menorrhagia, can have several causes, especially after age 40. One possible cause is a bleeding disorder, such as Factor V deficiency, which affects blood clotting and can lead to heavier menstrual bleeding.

Another potential cause is related to hormonal changes that occur as women approach menopause. These changes can lead to irregular and heavy periods. Additionally, conditions affecting the uterus, such as fibroids or polyps, can also result in heavy menstrual bleeding.

Here are some potential causes of heavy periods with clots after age 40:

Bleeding Disorders: Conditions like Factor V deficiency can impact how blood clots, leading to heavy periods.
Hormonal Changes: As women get closer to menopause, hormonal shifts can cause heavier and more irregular periods.
Uterine Conditions: Issues like fibroids or polyps can cause increased bleeding during menstruation.

If you experience heavy periods with clots, you can use Ubie's free AI symptom checker to help identify potential causes and determine whether you should consult a healthcare professional for a proper diagnosis and management plan.

(References)

Bennett K, Daley ML, & Pike C. (1997). Factor V deficiency and menstruation: a gynecologic .... Obstetrics and gynecology, 9166342.
Blum M, & Blum G. (1992). The possible relationship between menorrhagia and occult .... Advances in contraception : the official journal of the Society for the Advancement of Contraception, 1290333.
Brenner PF. (1996). Differential diagnosis of abnormal uterine bleeding. American journal of obstetrics and gynecology, 8828559.

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.