Can Fibroids Affect Your Bladder?

Fibroids can absolutely affect your bladder, and they do so more often than many people realize. A recent systematic review found that roughly half of women with uterine fibroids experience some form of lower urinary tract symptoms, from needing to urinate constantly to leaking urine to, in rare cases, being unable to empty the bladder at all.¹ The connection is mechanical at its core, but the range of bladder problems fibroids can trigger is wider than most people expect, and the relationship between fibroid size, location, and symptom severity is not always straightforward.

Why the Uterus and Bladder Are So Closely Linked

The uterus sits directly behind the bladder in the pelvis, separated by only a thin layer of tissue. Because fibroids grow from the muscular wall of the uterus, they can push forward into the bladder, press downward on the urethra (the tube that drains the bladder), or grow sideways and lean against the ureters (the tubes connecting the kidneys to the bladder). A fibroid does not have to be enormous to cause trouble; even a moderately sized one in just the right spot on the front wall of the uterus can distort the bladder’s shape and interfere with normal filling and emptying.²

That said, fibroids vary enormously. They range from the size of a pea to larger than a grapefruit, and the uterus can host just one or dozens at a time. Some grow on the outside surface of the uterus, some sit within the muscular wall, and some bulge into the uterine cavity. The ones most likely to bother your bladder are those that sit on the anterior (front) wall of the uterus or those that grow large enough to fill up pelvic space regardless of location.

The Most Common Bladder Symptoms

If you have fibroids and find yourself racing to the bathroom throughout the day and night, you are far from alone. In one study of women scheduled for fibroid surgery, nocturia (waking at night to urinate) affected about nine out of ten participants, urgency affected roughly six in ten, and urinary incontinence showed up in about half.³ Those numbers reflect women whose fibroids were bothersome enough to seek surgery, so the rates in the broader fibroid population are lower. Across all studies pooled together, the overall prevalence of lower urinary tract symptoms in fibroid patients sits around 49%, with individual symptoms like frequency, urgency, nocturia, and incontinence ranging from about 15% to 54%.¹

The underlying cause for these “storage” symptoms is usually straightforward: a bulky uterus pushes into the bladder and reduces how much urine it can comfortably hold. When your bladder cannot expand fully, it fills to capacity sooner and sends urgent signals more often. Research has confirmed that the pressure an enlarged fibroid uterus exerts on the bladder is the direct driver of frequency, urgency, and nocturia in many patients.⁴

A quality-of-life survey specifically focused on fibroids and urinary symptoms found that 60% of participants were at least “somewhat bothered” by frequent daytime urination and 47% by waking at night to urinate.⁵ For many women, the constant bathroom trips and sleep disruption rank among the most frustrating aspects of living with fibroids, sometimes rivaling or surpassing the heavy menstrual bleeding that gets more clinical attention.

Fibroids and Urinary Incontinence

Leaking urine is one of the most distressing bladder symptoms fibroids can cause, and it comes in more than one form. Some women experience stress urinary incontinence, which means leaking when they cough, sneeze, laugh, or exercise. Others deal with urge incontinence, the sudden overwhelming need to urinate followed by leaking before reaching a toilet. Many have a mix of both.

A large study that compared women with and without fibroids found that stress urinary incontinence was measurably more common in women who had fibroids, with about a 7 to 10 percentage-point higher prevalence depending on fibroid size. The association was strongest for fibroids in the 2-to-4-centimeter range and for those located on the anterior wall of the uterus.⁶ The mechanism likely involves the fibroid altering the angle or support of the bladder neck and urethra, changing how well those structures seal during moments of physical strain.

This matters practically because many women with incontinence never connect it to their fibroids. They may try pelvic floor exercises, limit fluid intake, or simply accept leaking as inevitable, without realizing that treating the fibroids could resolve or at least improve the problem.

When Fibroids Block Urine Flow

While the “too much urination” symptoms get most of the attention, fibroids can also cause the opposite problem: difficulty emptying the bladder, or in extreme cases, complete inability to urinate. This happens when a fibroid presses on the urethra or bladder neck hard enough to physically obstruct the outflow of urine.

The obstruction can happen in different ways. Sometimes a large fibroid directly compresses the urethra, squeezing it shut. In other cases, the mechanism is more indirect. One reported case involved a fibroid that lifted and suspended the bladder, creating a sharp bend at the bladder neck (called hyperangulation) that blocked urine flow without directly pressing on the urethra itself.⁷ In another case, a severely retroflexed (backward-tilting) fibroid uterus compressed both the urethra and the bladder neck, leading to prolonged complete urinary obstruction that lasted months before being discovered.⁸

Acute urinary retention from fibroids, where you suddenly cannot urinate at all and need a catheter, is uncommon but not vanishingly rare. It tends to be a medical emergency that brings women to the hospital with severe lower abdominal pain and a painfully full bladder. The fibroid responsible is usually large or positioned in a way that acutely pinches off the outflow tract.

Fibroids During Pregnancy and Acute Retention

Pregnancy is one setting where fibroid-related urinary retention becomes more likely. Fibroids tend to grow during pregnancy due to increased hormone levels, and the enlarging uterus shifts position in the pelvis. Both factors can combine to push a fibroid into contact with the bladder neck or urethra in ways that were not causing problems before conception. Acute urinary retention and a type of fibroid degeneration called “red degeneration” are among the most familiar acute fibroid complications obstetricians encounter during pregnancy.⁹

If you are pregnant and have known fibroids, urinary retention does not happen often, but it is worth being aware of. The warning signs include suddenly being unable to urinate despite feeling full, increasing lower abdominal pressure, and pain. It typically requires catheter drainage and close monitoring, though the obstruction often resolves as the uterus rises out of the pelvis later in pregnancy.

When Fibroids Threaten the Kidneys

The most serious urinary complication of fibroids involves the upper urinary tract, specifically the ureters and kidneys. A very large fibroid, or one positioned near the pelvic brim, can compress a ureter and block urine from draining out of the kidney. When urine backs up, the kidney swells (a condition called hydronephrosis), and if the blockage is not relieved, kidney function can decline.

This complication is rare but real. In one case report, a large fibroid caused bilateral ureteral obstruction, meaning both ureters were blocked, leading to severe kidney impairment with a creatinine level of 4.0 mg/dL, new-onset high blood pressure, and significant swelling of both kidneys.¹⁰ In a separate series of cases, giant fibroids were confirmed to cause kidney obstruction by compressing the ureter at the pelvic brim.¹¹

What makes ureteral obstruction tricky is that it can develop silently. The kidney may swell and lose function over weeks or months without causing dramatic symptoms, especially if only one side is affected (the other kidney compensates). By the time the problem is caught, sometimes through routine blood work or an imaging study done for another reason, significant damage may already be done. This is one reason clinicians sometimes recommend imaging of the kidneys and ureters when fibroids are very large, even in the absence of specific kidney symptoms.

Which Fibroids Cause the Most Bladder Problems

You might assume that bigger fibroids always mean worse bladder symptoms, but the relationship is not that simple. Fibroid location matters at least as much as size, and some research suggests it matters more.

Women with fibroids on the anterior (front) wall of the uterus tend to score significantly worse on voiding symptom scales than women whose fibroids sit elsewhere, even after accounting for age, number of prior pregnancies, and body mass index.³ That makes intuitive sense: the bladder sits in front of the uterus, so a fibroid growing in its direction is most likely to push into bladder territory.

At the same time, larger uterine volume does correlate with more severe urgency symptoms, so overall bulk still plays a role. Urgency was significantly worse in women with larger uterine volumes in the same study. The picture that emerges is that a small anterior fibroid can punch above its weight in terms of bladder bother, while a large fibroid growing in a different direction may produce more bleeding and pelvic pain than urinary problems.

Interestingly, one study of 338 women found that when you look at overall pelvic floor distress (a broader measure that includes bladder, bowel, and prolapse symptoms), clinical factors like higher body mass index and greater number of prior births were more strongly linked to symptom severity than fibroid size, fibroid volume, or even fibroid location. Uterine volume and fibroid position did not reach statistical significance for predicting pelvic floor symptom severity in that cohort. The finding suggests that for some women, the fibroids may be getting blamed for bladder symptoms that are partly driven by other factors like weight or pelvic floor weakness from childbirth.

How Treatment Improves Bladder Symptoms

If fibroids are making your bladder miserable, the encouraging news is that treating the fibroids typically improves urinary symptoms, often substantially.

Surgery

Surgical removal of fibroids (myomectomy) or of the uterus (hysterectomy) tends to produce the most dramatic improvements. One study found that by six weeks after fibroid surgery, urinary symptom scores had improved significantly across the board.¹² A more detailed study (the FAB study) tracked women before and after surgical fibroid removal and found that median distress scores dropped substantially. About two-thirds of women who had moderately to severely bothersome urge incontinence before surgery were cured of it afterward, and a similar proportion were cured of stress incontinence.¹³

Those cure rates are meaningful. They indicate that for many women, the fibroids really were the primary driver of their incontinence, not just a bystander. However, about a third of women with significant incontinence before surgery still had it afterward, which fits with the earlier point that other factors (pelvic floor weakness, body weight, childbirth history) also contribute to bladder symptoms independently of fibroids.

Uterine Fibroid Embolization

For women who want to avoid surgery, uterine fibroid embolization (a procedure that blocks blood flow to fibroids, causing them to shrink) also helps with bladder symptoms. At three months after embolization, patients reported significant improvement in urinary distress scores and quality of life. Bladder diaries confirmed fewer daytime and nighttime bathroom trips. However, the number of incontinence episodes did not decrease significantly, suggesting that embolization may relieve pressure-related frequency and urgency better than it corrects incontinence.¹⁴

An interesting finding from that embolization study: the degree of bladder symptom improvement did not depend on uterine volume, fibroid size, fibroid location, or even whether MRI confirmed that the fibroid was directly compressing the bladder. Instead, body mass index had the strongest influence on how much urinary distress scores improved, with heavier patients seeing less improvement. This reinforces the idea that bladder symptoms in fibroid patients are often a team effort between the fibroids and other contributing factors.

Medication

Drug treatments for fibroids, particularly GnRH agonists that temporarily shrink fibroids by suppressing estrogen, can also relieve bladder symptoms. In at least one published case, a woman with recurrent urinary retention from a fibroid was successfully treated with a GnRH agonist as a nonsurgical alternative, with the fibroid shrinking enough to relieve the obstruction.¹⁵ GnRH agonists are not a permanent fix (fibroids usually regrow once the medication stops), but they can buy time, reduce symptoms before planned surgery, or serve as a bridge to menopause, when fibroids naturally shrink.

How Fibroid-Related Bladder Problems Get Missed

One of the persistent frustrations in fibroid care is that bladder symptoms often get evaluated in isolation. A woman who goes to her doctor complaining of frequent urination or incontinence may be assessed for urinary tract infections, overactive bladder, or pelvic floor dysfunction without anyone checking whether fibroids are contributing. Conversely, a woman being seen by a gynecologist for heavy periods and fibroid diagnosis may not be asked about bladder symptoms at all.

The disconnect exists partly because bladder symptoms and gynecologic problems have historically been managed by different specialists. It also exists because many women normalize their urinary symptoms over time, especially if the fibroids grow gradually. When the bladder capacity shrinks slowly over months or years, you may not register how often you are going to the bathroom until it becomes extreme. The quality-of-life data bears this out: more than 60% of fibroid patients in one study reported being at least somewhat bothered by pelvic tightness and pressure, and 60% by frequent urination, yet these complaints are not always front and center in clinical conversations about fibroids.⁵

If you have known fibroids and are also dealing with bladder issues, it is worth connecting those dots explicitly when talking to your healthcare provider. Mention both. Ask whether your urinary symptoms could be related to the fibroids, and whether treating the fibroids might help. The evidence suggests that for many women, it does.

When Bladder Symptoms Are Not Actually From Fibroids

Not every bladder symptom in a woman with fibroids is caused by those fibroids. Overactive bladder, urinary tract infections, interstitial cystitis, pelvic organ prolapse, and neurological conditions can all produce overlapping symptoms. Body weight is an independent and powerful driver of urinary symptoms as well, which is why some women with large fibroids have no bladder complaints while other women with smaller fibroids are constantly running to the bathroom.

The research on fibroid embolization found that BMI was the strongest predictor of how much urinary distress improved after treatment, not the fibroid characteristics themselves.¹⁴ This does not mean fibroids are irrelevant, but it does mean the picture is often more complicated than “fibroid pushes on bladder, bladder acts up.” A thorough evaluation that considers all possible contributors gives you the best shot at actually resolving the symptoms, rather than pinning everything on the fibroids only to find that bladder problems persist after treatment. For roughly a third of women who undergo fibroid surgery, incontinence does continue afterward, suggesting that fibroids were only part of the equation.

1
PubMed Central. Lower Urinary Tract Symptoms in Uterine Myoma: A Systematic Review and Meta-Analysis
2
PubMed. Urological complications of uterine leiomyoma: a review of literature
3
Female Pelvic Medicine & Reconstructive Surgery. Lower Urinary Tract Symptoms in Patients With Uterine Fibroids: Association With Fibroid Location and Uterine Volume
4
PubMed. The effect of large uterine fibroids on urinary bladder function and symptoms
5
PubMed. Fibroids and Urinary Symptoms Study (FUSS)
6
PubMed Central. Uterine leiomyomata associated with self-reported stress urinary incontinence
7
Urology Case Reports. Acute urinary retention from hyperangulation of the urinary bladder neck secondary to uterine leiomyoma, a case report
8
PubMed Central. A 30-Month Complete Urinary Obstruction Resulting from Trapped and Incarcerated Uterus: A Case Report
9
PubMed. Acute complications of fibroids
10
PubMed Central. Bilateral Obstructive Uropathy From a Large Uterine Fibroid Causing Severe Renal Impairment: A Case Report
11
PubMed. Uterine artery embolization for ureteric obstruction secondary to fibroids
12
PubMed. Impact of uterine fibroid surgery on lower urinary tract symptoms
13
PubMed. Fibroid surgery and improvement in bladder symptoms: The FAB study
14
PubMed. The effect of uterine fibroid embolization on lower urinary tract symptoms
15
Urogynecology. Treatment of Urinary Retention Caused by Uterine Leiomyoma With a Gonadotropin-Releasing Hormone Agonist