Are blood clots a common symptom of endometriosis?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Blood clots are not typically listed as a hallmark symptom of endometriosis. However, many people with endometriosis do report passing large blood clots during menstruation, often alongside heavy bleeding, severe cramps, and prolonged periods. While clotting can occur with normal menses, unusually large or frequent clots may signal an underlying condition like endometriosis, fibroids, or a hormonal imbalance that warrants further evaluation.

If you're experiencing blood clots along with pelvic pain, fatigue, or irregular cycles, don't dismiss these signs. Understanding what's driving your symptoms is the first step toward relief and effective treatment. Take a free, instant, online symptom check to get personalized insights into possible causes and clear guidance on your next steps—no appointment or sign-up required.

Reviewed for medical accuracy: 07/15/2026

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Explanation

The references provided do not specifically mention blood clots as a common symptom of endometriosis. Endometriosis is a condition where tissue similar to the lining inside the uterus grows outside of it. The references discuss unusual cases of endometriosis, such as one involving the chest area and another in a non-human primate. Additionally, there is a report about a large blood-filled cyst in the fallopian tube, known as a hematosalpinx, which can occur with endometriosis.

While these cases highlight some of the unusual presentations and complications of endometriosis, they do not specifically address blood clots as a typical symptom. Endometriosis can cause a variety of symptoms, but the focus of the provided references is on rare occurrences rather than common symptoms. If you're experiencing symptoms that concern you, check your symptoms or consult with a healthcare provider for personalized advice.

(References)

Lee HT, Wang HC, Huang IaT, Chang HC, & Lu JY. (2006). Endometriosis associated with hemothorax. Journal of the Chinese Medical Association : JCMA, 16447926.
Nakamura S, Ochiai K, Ochi A, Ito M, Kamiya T, & Yamamoto H. (2012). Spontaneous endometriosis in a mandrill (Mandrillus sphinx). Journal of comparative pathology, 22520805.
Sulaman H, Hussain SA, Nawaz S, & Anwar A. (2021). Case report of an un-usually large hematosalpinx. The journal of obstetrics and gynaecology research, 33611857.

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