When you think about endometriosis- painful periods, pelvic pain, and fertility challenges may be the first symptoms that come to mind.
But what about feeling like you constantly need to pee? Bladder pressure? Pain when your bladder is full? Or urinary symptoms that seem to get worse around your period?
Endometriosis can affect the urinary system, including the bladder. Urinary tract endometriosis is uncommon, but when it does occur, the bladder is the most frequently affected urinary organ. Recent reviews estimate urinary tract involvement in approximately 1% to 2% of people with endometriosis.¹˒²
There’s another important piece of the puzzle, though: having endometriosis and bladder symptoms doesn’t necessarily mean endometriosis has grown on your bladder.
Bladder symptoms can have several possible explanations, including a UTI, overactive bladder, pelvic floor dysfunction, or interstitial cystitis/bladder pain syndrome (IC/BPS). Understanding the pattern of your symptoms can help you and your healthcare provider figure out what may be going on.
Endometriosis occurs when tissue similar to the lining of the uterus grows outside the uterus.
In some cases, endometriosis can involve the urinary tract, including the bladder and ureters, which are the tubes that carry urine from the kidneys to the bladder. Bladder endometriosis accounts for an estimated 70% to 85% of urinary tract endometriosis cases.¹
Bladder endometriosis is also frequently associated with deep endometriosis, where lesions extend deeper into pelvic tissues.²
But here’s where things get a little more complicated: endometriosis doesn’t necessarily have to physically involve your bladder for you to experience urinary symptoms.
A 2025 systematic review found that overactive bladder symptoms can coexist with endometriosis even when the urinary tract itself isn’t affected.³
So if you have endometriosis and your bladder suddenly seems to have a mind of its own, it’s worth investigating rather than assuming there’s only one possible explanation.
Bladder endometriosis doesn’t look exactly the same for everyone.
Possible symptoms can include:
Some people may have surprisingly few urinary symptoms, which is one reason urinary tract endometriosis can be difficult to recognize.¹˒⁴
One particularly helpful clue is timing.
If your urinary symptoms reliably appear or worsen around your period, tell your healthcare provider. European Society of Human Reproduction and Embryology (ESHRE) patient guidance specifically notes that cyclical bladder dysfunction should raise suspicion for endometriosis rather than automatically being attributed to an infection.⁵
Urinary frequency means needing to urinate more often than usual.
It can happen for plenty of reasons that have nothing to do with endometriosis. But if you’ve already been diagnosed with endometriosis or have other symptoms suggestive of it, urinary frequency is worth mentioning to your healthcare provider.
Research suggests lower urinary tract symptoms can occur in bladder and other forms of deep endometriosis. A 2026 meta-analysis examining parametrial endometriosis, for example, found lower urinary tract symptoms in a proportion of patients before surgery.⁶
The pattern matters. Consider whether your urinary frequency changes throughout your menstrual cycle or appears alongside worsening pelvic pain.
Painful urination is called dysuria.
Most people understandably associate burning or pain when urinating with a UTI. And a UTI absolutely needs to be considered.
But dysuria can also occur with bladder endometriosis. A systematic review of bladder endometriosis studies found dysuria was reported in roughly 27% of patients, although the available evidence was largely based on observational studies and case series.⁷
If urine testing repeatedly comes back negative but painful urination continues, particularly if it follows your menstrual cycle, it may be worth investigating other explanations.
Sometimes bladder symptoms aren’t as obvious as burning or urgency.
Instead, you may notice a heavy, uncomfortable sensation in your lower abdomen or pelvis. It might feel like pressure around your bladder or like you need to urinate even when you recently went.
This can become particularly confusing because bladder-related pain can overlap with the pelvic pain associated with endometriosis.
Keeping track of when the discomfort happens can provide useful information.
Does it worsen before or during your period?
Does it get worse as your bladder fills?
Does urinating make it feel better?
Does it happen alongside bowel symptoms or pain during sex?
Those details can help your healthcare provider consider whether the bladder itself, endometriosis, pelvic floor muscles, or another condition may be contributing.
Blood in the urine is called hematuria, and it should always be discussed with a healthcare professional.
When blood appears in the urine in a recurring pattern around menstruation, it can be an important clue for urinary tract endometriosis. A 2022 review described cyclical visible blood in the urine as a particularly characteristic presentation.⁴
But here’s something important: not having blood in your urine does not rule out bladder endometriosis.
A 2026 review notes that cyclical hematuria occurs in fewer than half of people with bladder endometriosis.⁸
So while it’s an important symptom, it isn’t something everyone with bladder endometriosis will experience.
This is one of the patterns worth paying close attention to.
Endometriosis is influenced by hormonal changes throughout the menstrual cycle, and symptoms associated with endometriosis are often cyclical.
If you notice a recurring pattern like:
Period approaching → bladder pressure increases → urinary urgency or pain appears → symptoms settle after your period
write it down.
That information may be more helpful than simply telling your healthcare provider, “I pee a lot.”
At the same time, urinary tract endometriosis doesn’t always cause cyclical symptoms, so symptoms occurring throughout the month shouldn’t automatically rule it out.⁴
This is an important question because the symptoms can look remarkably similar.
Interstitial cystitis/bladder pain syndrome (IC/BPS) is a chronic bladder condition associated with bladder pain, pressure, or discomfort and urinary symptoms such as frequency and urgency.
Both endometriosis and IC can cause:
| Symptom | Endometriosis | IC/BPS |
| Pelvic pain | ✓ | ✓ |
| Urinary frequency | ✓ | ✓ |
| Urgency | ✓ | ✓ |
| Bladder pressure | ✓ | ✓ |
| Pain during sex | ✓ | ✓ |
| Symptoms that fluctuate | ✓ | ✓ |
| Pain strongly associated with menstruation | More characteristic | Can occur |
| Pain related to bladder filling | Can occur | More characteristic |
The overlap is significant enough that urinary tract endometriosis can be mistaken for IC, recurrent UTIs, overactive bladder, or kidney stones.⁴
And it doesn’t necessarily have to be one or the other. Endometriosis and IC can coexist. Persistent pelvic or bladder symptoms after endometriosis treatment may therefore warrant evaluation for another contributor rather than assuming all remaining pain is still coming from endometriosis.
It could be.
Urinary frequency, urgency, pelvic discomfort, and painful urination can all occur with a urinary tract infection.
That’s why ruling out infection is an important first step when new urinary symptoms appear.
But repeated “UTI-like” symptoms without evidence of infection deserve a closer look.
If your urine tests keep coming back negative, antibiotics don’t resolve the problem, or your symptoms predictably return around your period, talk with your healthcare provider about whether another condition could be contributing.
Symptoms alone aren’t enough to diagnose bladder endometriosis.
Evaluation may include a detailed medical history, pelvic examination, urine testing to rule out other causes, and imaging.
Specialized transvaginal ultrasound and pelvic MRI can help identify and map urinary tract endometriosis. Recent evidence highlights improvements in both techniques for assessing suspected disease before treatment or surgery.⁹
Importantly, current endometriosis guidelines have moved away from the idea that diagnostic laparoscopy must always be the first step in diagnosing endometriosis. Imaging and clinical assessment now play an important role in the diagnostic process.⁵
The appropriate workup depends on your symptoms and where endometriosis is suspected.
The bladder isn’t the only part of the urinary system that endometriosis can affect.
Endometriosis can involve a ureter, potentially narrowing or obstructing the tube that carries urine from a kidney to the bladder.
The tricky part is that ureteral involvement can sometimes cause few or no obvious symptoms. Reviews of urinary tract endometriosis have highlighted the risk of unnoticed urinary obstruction and, in severe cases, loss of kidney function.¹˒⁴
This doesn’t mean everyone with endometriosis needs to worry about their kidneys. Urinary tract involvement remains uncommon.
But it does reinforce why persistent or unusual urinary symptoms deserve proper evaluation rather than being dismissed as “just part of endometriosis.”
If you’re trying to understand whether your bladder symptoms might be connected to endometriosis, tracking them for a few cycles can be incredibly useful.
Write down:
You don’t need a complicated spreadsheet. You’re simply looking for patterns.
If bladder symptoms consistently intensify at the same point in your cycle, that’s valuable information to bring to an appointment.
Consider bringing up bladder symptoms if they’re persistent, worsening, repeatedly returning, interfering with sleep or everyday activities, or occurring alongside other symptoms of endometriosis.
It’s especially worth discussing if:
Visible blood in your urine should be medically evaluated rather than assumed to be caused by endometriosis.
Yes, endometriosis can affect your bladder and urinary tract. But having endometriosis plus bladder symptoms doesn’t automatically mean you have bladder endometriosis.
Frequent urination, urgency, bladder pressure, painful urination, and pelvic pain can have several potential causes, including UTIs, overactive bladder, IC/BPS, pelvic floor dysfunction, and urinary tract endometriosis.
One of the most useful things you can do is pay attention to the pattern.
Does it happen around your period? Does your bladder hurt when it’s full? Does urinating relieve the discomfort? Do you repeatedly experience UTI-like symptoms despite negative tests?
Those details can help turn a vague symptom like “my bladder feels off” into useful information that you and your healthcare provider can investigate.
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