Heavy Bleeding and Large Clots: Could It Be Endometriosis?

October 29, 2025

Passing small blood clots during your period can be a normal part of menstruation. These gel-like clumps of blood, tissue, and uterine lining are your body’s way of managing a heavy flow. However, when these clots become consistently large—bigger than the size of a quarter—and are accompanied by heavy bleeding that soaks through pads or tampons every hour, it could be a sign of an underlying condition like endometriosis.

At Endometriosis Surgical Specialists International (ESSI), we believe in empowering patients with knowledge. Understanding the potential causes of your symptoms is the first step toward finding a solution.

How Endometriosis Causes Large Blood Clots

Endometriosis is a primary culprit behind heavy menstrual bleeding (menorrhagia) and the formation of large clots. Here’s why:

  • Increased Inflammation: Endometrial-like tissue growing outside the uterus creates a significant inflammatory response in the pelvis. This inflammation can interfere with the uterine muscle’s ability to contract effectively, leading to heavier bleeding.
  • Hormonal Disruption: The inflammation from endometriosis can disrupt the delicate hormonal balance that regulates the menstrual cycle, leading to a thicker uterine lining that results in a heavier, clot-filled period.
  • Associated Conditions: Endometriosis often coexists with adenomyosis, a condition where the uterine lining grows into the muscular wall of the uterus. This directly causes the uterus to become enlarged and boggy, leading to severe bleeding and painful, large clots.

“Patients often tell us they were told that debilitating periods with large clots were ‘just a part of being a woman.’ That is a dangerous misconception,” notes the team at ESSI. “These symptoms are not normal and often point directly to endometriosis or related conditions that require specialized diagnosis and treatment.”

Other Potential Causes for Large Clots

While endometriosis is a major cause, other conditions can also lead to heavy bleeding and clotting. It’s important to consider all possibilities for an accurate diagnosis:

  1. Uterine Fibroids: These non-cancerous growths in the uterus can distort the uterine cavity, leading to heavier periods.
  2. Hormonal Imbalances: Conditions like Polycystic Ovary Syndrome (PCOS) or thyroid issues can disrupt the menstrual cycle.
  3. Uterine Polyps: Small, benign growths on the uterine lining can cause heavy or irregular bleeding.
  4. Bleeding Disorders: Inherited conditions like von Willebrand disease can impair the body’s ability to clot blood properly.
  5. Miscarriage: Passing large clots can unfortunately be a sign of an early pregnancy loss.

When and Where to Seek a Specialist

If you are consistently passing large blood clots and experiencing heavy, painful periods that disrupt your life, it is time to seek expert medical care. At Endometriosis Surgical Specialists International (ESSI), our world-class team specializes in diagnosing the true root cause of your symptoms.

We are dedicated to making this exceptional care accessible, with great treatment options in New York, New Jersey, California (including Orange County), and Miami. Furthermore, we are expanding close to a place near you. Don’t let debilitating symptoms control your life. Contact ESSI today to schedule a consultation and get the answers and relief you deserve.

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