What is Fibroid Sloughing?

What Happens During Fibroid Sloughing?

Fibroid sloughing describes fibroid tissue detaching from the uterine wall and passing out of the body, usually through the vagina. It typically follows fibroid degeneration, the process in which a fibroid loses its blood supply and the tissue begins to die and break down into necrotic, or dead, tissue. Sloughing is most closely associated with uterine fibroid embolization (UFE), a treatment that works by intentionally blocking blood flow to fibroids so they shrink over time. It is noted that approximately 5% of patients will pass pieces of dead (necrotic) fibroids. Sloughing can also occur naturally without any procedure and typically would occur within first several weeks to months of undergoing UFE.

This process is sometimes called fibroid shedding or, in more complete cases, fibroid expulsion, though these terms describe slightly different degrees of tissue loss. Sloughing generally is not considered a sign that treatment has failed. It is often associated with the fibroid responding as expected to reduced blood supply.

Natural fibroid degeneration develops when a fibroid grows so large that its blood supply can no longer adequately support it. Fibroids rely on a network of blood vessels to deliver oxygen and nutrients. As the fibroid enlarges, it may exceed the capacity of its blood supply, causing portions of the tissue to become deprived of oxygen. Without adequate nourishment, fibroid cells begin to die, and the fibroid starts to degenerate.

Fibroid Sloughing Following UFE

What Does Fibroid Sloughing Look and Feel Like?

Fibroid sloughing discharge typically looks like a heavier version of menstrual bleeding: dark red, brown, or clotted, and sometimes containing visible tissue fragments that can range from small pieces to, rarely, several inches in length. The discharge may have a noticeable but mild odor. A stronger, foul smell is not typical of routine sloughing and is associated with possible infection.

During degeneration, women may experience a range of symptoms, including pelvic pain, cramping, abdominal tenderness, pelvic pressure, bloating, low-grade fever, or bleeding changes. The discomfort can range from mild to severe depending on the size and location of the fibroid and the extent of tissue breakdown. While the pain associated with degeneration can be alarming, it often subsides as the body reabsorbs or eliminates the dead tissue. In some cases, degenerating fibroids can trigger inflammation in the surrounding area, contributing to temporary discomfort and period-like symptoms.

In certain situations, degeneration progresses to fibroid sloughing. As portions of the fibroid die, they may separate from the uterine wall and pass through the cervix and vagina. Women may notice tissue-like material, increased vaginal discharge, bleeding, or cramping during this process.

Physically, sloughing is often associated with cramping that feels similar to menstrual cramps, though it can be more intense for some women, along with a sensation of pressure or heaviness in the pelvis as tissue moves through the cervix. Many women describe the sensation as a heavier, crampier period rather than a distinct or alarming event, which is part of why sloughing is sometimes mistaken for unusual menstrual bleeding.

What Are the Symptoms of Fibroid Sloughing?

Beyond the discharge and cramping described above, fibroid sloughing symptoms can include mild fatigue, a low-grade fever, and, in some cases, a temporary increase in usual fibroid-related pelvic pressure as tissue is cleared from the uterus. Symptoms that may point to a normal course of sloughing include cramping similar to menstrual cramps, discharge resembling a heavy period with small clots or tissue, and mild fatigue that improves over a few days.

Note: If discharge has a strong odor or bleeding becomes heavier than a typical period, contact a healthcare provider promptly, since these can be signs of infection rather than routine sloughing.

How Long Does Fibroid Sloughing Last?

Sloughing Duration After UFE

Fibroid sloughing linked to UFE can last anywhere from a few days to a few weeks, since multiple treated fibroids may begin degenerating around the same time.^[2] Some clinical sources describe a typical passage window of 36 to 48 hours for an individual fibroid fragment, while broader sloughing following the procedure can continue for several weeks as different fibroids complete the process at different rates.

Sloughing Duration With Natural Fibroid Degeneration

Sloughing that happens naturally, without treatment, tends to be shorter and may resolve within several days as the fibroid stabilizes. Duration can vary based on fibroid size, number, and location, so a fibroid specialist can offer a more personalized timeline based on your case.

Can Fibroid Sloughing Happen Without UFE or Other Treatment?

Fibroid sloughing can occur without any procedure when a fibroid outgrows its blood supply and begins to break down on its own. This is sometimes called spontaneous or natural fibroid degeneration, and it follows the same basic mechanism as post-UFE sloughing: reduced blood flow leads to tissue death, and the body works to clear the dead tissue.

This natural degeneration cycle may repeat if portions of the fibroid retain enough blood flow to remain viable, allowing symptoms or growth to persist. Because this cycle can recur, natural sloughing does not address the underlying fibroid, and symptoms may return periodically until the fibroid is treated.

If you want to understand this mechanism in more depth, this guide to fibroid degeneration explains how and why fibroids break down over time.

Can a Fibroid Slough Out Completely?

In rare cases, a fibroid can fully detach and pass out of the uterus in a process sometimes called fibroid expulsion. This is more common with submucosal fibroids, which grow just beneath the uterine lining, and typically occurs after treatments like UFE that cut off a fibroid’s blood supply.

Complete expulsion may cause a sudden increase in cramping, pelvic pressure, or bleeding as the fibroid passes, and it is often followed by noticeable relief once the process finishes. Because expulsion can sometimes be incomplete or associated with infection, any suspected full passage of a fibroid should be confirmed by your care provider.

When Should You Contact a Doctor About Fibroid Sloughing or Discharge?

Most fibroid sloughing resolves on its own with rest and over-the-counter pain relief as needed, but certain symptoms are associated with a higher likelihood of complications. Contact your healthcare provider if you notice a fever, foul-smelling discharge, bleeding that soaks through pads quickly, or pain that feels more severe than expected.

These symptoms may be associated with infection or tissue that has not fully passed, both of which can require evaluation and, in some cases, a follow-up procedure. Reviewing the broader signs your fibroids may be breaking down can also help you recognize when a pattern of symptoms warrants a call to your provider rather than a wait-and-see approach.

Do You Have to Wait for a Fibroid to Break Down on Its Own?

Natural fibroid degeneration can shrink a fibroid temporarily, but because the process is not targeted or permanent, the fibroid’s blood supply may be retained and the growth cycle can begin again. Waiting for a fibroid to break down on its own does not offer a predictable or lasting way to manage fibroid symptoms.

How Does UFE Cause Fibroid Sloughing?

Uterine fibroid embolization intentionally triggers the same degeneration process that happens naturally, but in a controlled and targeted way. During the procedure, an interventional radiologist guides small embolic particles into the artery feeding a specific fibroid, cutting off its blood supply. Without oxygen and nutrients, the fibroid tissue dies and begins to break down, which is why cramping, discharge, and sloughing are common and expected in the weeks that follow. Because UFE targets the fibroid’s specific blood supply rather than the fibroid growing past it naturally, the resulting degeneration and sloughing tends to be more predictable in timing than spontaneous degeneration.

Uterine Fibroid Embolization (UFE)

Uterine fibroid embolization uses imaging guidance to direct a thin catheter to the arteries supplying a fibroid, then introduces small embolic particles that block blood flow to the targeted fibroid tissue. Because the treatment is catheter-based rather than surgical, it preserves the uterus and typically involves a shorter recovery than surgical alternatives.

UFE does not eliminate the possibility that new fibroids may form in the future, so ongoing monitoring with a fibroid specialist remains an important part of long-term care.

If you are living with fibroid symptoms and want to understand whether this approach may be appropriate for your situation, learning whether you may be a good candidate for UFE is a helpful first step.