Last updated: October 7, 2026
Written and edited by: Adel Galal, Founder and Editor of NextFitLife
Medical review status: This article has not been medically reviewed by a doctor, gynecologist, urologist, radiologist, or other licensed healthcare professional.
Bladder endometriosis is a form of endometriosis that affects the bladder wall, usually the muscle layer called the detrusor.
Bladder endometriosis can cause pain with urination, urinary urgency, frequency, pelvic pressure, bladder discomfort, and sometimes visible blood in the urine. A major clue is that symptoms may become worse around menstruation, although they do not always follow a perfect monthly pattern.
Because these symptoms can look like a urinary tract infection, overactive bladder, kidney stones, or interstitial cystitis, diagnosis is sometimes delayed.
This article is for general information and education. It does not replace medical advice, diagnosis, or treatment.
Seek prompt medical care if you have visible blood in the urine, severe flank pain, fever, vomiting, difficulty passing urine, or severe worsening pelvic pain.
Also seek urgent care if urinary symptoms come with fever, chills, back or kidney area pain, or feeling very unwell, because infection or urinary obstruction needs to be ruled out.
Do not assume blood in the urine is caused by endometriosis. Stones, infection, kidney disease, and bladder or urinary tract cancer can also cause hematuria and need proper assessment.
Table of Contents
- Quick Answer
- 11 Critical Signs
- Painful urination
- Urinary urgency
- Urinary frequency
- Blood in the urine
- Bladder pain
- Pelvic pain
- Symptoms near menstruation
- Pain during sex
- Repeated negative UTI tests
- Lower abdominal pressure
- Possible ureter involvement
- Diagnosis
- Ultrasound and MRI
- Treatment
- Surgery
- Recurrence
- Frequently Asked Questions
Bladder Endometriosis: Quick Answer
Bladder endometriosis means endometriosis tissue has invaded the bladder wall.
The condition may cause:
- Pain when urinating
- Urinary urgency
- Frequent urination
- Pelvic or lower abdominal pain
- Bladder pressure
- Blood in the urine
- Symptoms that worsen around menstruation
The bladder is the most commonly affected part of the urinary tract in people with urinary tract endometriosis.
However, urinary tract endometriosis is still uncommon overall.
One important point is that urinary symptoms are not always present, and disease involving the ureters can sometimes progress silently.
What Is Bladder Endometriosis?
Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus.
When it affects the bladder muscle, it is called bladder endometriosis.
The condition is usually part of deep endometriosis.
Lesions often affect:
- The bladder dome
- The bladder base
- The posterior bladder wall
In some cases, lesions are close to the ureters, which carry urine from the kidneys to the bladder.
How Common Is Bladder Endometriosis?
Urinary tract endometriosis is much less common than pelvic endometriosis involving the ovaries, pelvic lining, bowel, or supporting ligaments.
Recent reviews estimate that urinary tract endometriosis affects about 1 percent of people with endometriosis, although reported rates vary depending on how deeply patients are assessed.
Among urinary tract cases, the bladder is the most common site and accounts for about 70 to 85 percent.
The ureters are the next most common site.
11 Critical Signs of Bladder Endometriosis
1. Pain When You Urinate
Dysuria means pain, burning, or discomfort during urination.
This is one of the better known urinary symptoms of bladder endometriosis.
The pain may:
- Occur only during menstruation
- Become worse around a period
- Persist at other times
A UTI is still a much more common cause of painful urination, so infection should usually be ruled out first.
2. Urinary Urgency
You may suddenly feel that you must urinate straight away.
This can feel similar to:
- A UTI
- Overactive bladder
- Interstitial cystitis
The timing of symptoms may provide a clue.
Urgency that becomes much worse around menstruation can raise suspicion for endometriosis, especially when pelvic pain is also present.
3. Frequent Urination
Some people with bladder endometriosis urinate more often than usual.
This may happen because the bladder wall is irritated or because deep pelvic disease affects bladder function.
Frequency alone is not specific.
Diabetes, pregnancy, UTI, overactive bladder, caffeine, and many other conditions can cause it.
4. Blood in the Urine
Hematuria means blood in the urine.
Visible blood that repeatedly appears near menstruation is an important clue to urinary tract endometriosis.
However, not everyone with bladder endometriosis develops hematuria.
Blood in the urine should always be medically evaluated because possible causes also include:
- UTI
- Kidney stones
- Kidney disease
- Bladder disease
- Urinary tract cancer
5. Bladder Pain
Bladder endometriosis can cause deep discomfort in the lower abdomen or directly over the bladder.
The pain may feel like:
- Pressure
- Burning
- A deep ache
- Cramping
Some people notice more pain when the bladder fills.
6. Pelvic Pain
Many people with bladder endometriosis also have other forms of pelvic endometriosis.
Pelvic symptoms may include:
- Severe period pain
- Chronic pelvic pain
- Pain during sex
- Pain with bowel movements
- Lower back pain
The combination of pelvic pain and urinary symptoms can be an important clue.
7. Symptoms That Worsen Around Menstruation
This is one of the strongest clues.
Urinary pain, urgency, frequency, or hematuria may become worse just before or during menstruation.
However, bladder endometriosis does not always behave in a perfectly cyclical way.
Symptoms can eventually become more constant.
8. Pain During or After Sex
Deep dyspareunia means pain deep inside the pelvis during or after sex.
It can occur when bladder endometriosis is present alongside other deep pelvic endometriosis.
This symptom is not specific to bladder disease, but it adds useful context.
9. Repeated UTI Symptoms With Negative Cultures
Some people are treated several times for suspected UTIs before another cause is considered.
If urinary burning, urgency, and bladder pain keep returning but urine cultures are repeatedly negative, the diagnosis should be reconsidered.
Possible alternatives include:
- Bladder endometriosis
- Interstitial cystitis
- Overactive bladder
- Pelvic floor dysfunction
- Urethral conditions
10. Lower Abdominal Pressure
A deep lesion in the bladder wall can sometimes produce pressure or fullness in the lower abdomen.
This symptom may become more noticeable when the bladder is full.
11. Signs of Ureter Involvement
The ureters are the tubes carrying urine from the kidneys to the bladder.
Endometriosis involving a ureter can cause:
- Flank pain
- Back pain
- Blood in the urine
- Kidney swelling
However, ureteral disease can sometimes produce few or no urinary symptoms.
This matters because persistent obstruction can cause hydronephrosis and eventually damage kidney function.
Bladder Endometriosis Symptoms at a Glance
| Symptom | Possible Meaning | Useful Clue |
|---|---|---|
| Painful urination | Bladder irritation | May worsen near menstruation |
| Urgency and frequency | Bladder involvement | Often overlaps with UTI symptoms |
| Blood in urine | Possible urinary tract involvement | Cyclical bleeding is particularly suggestive |
| Deep pelvic pain | Possible associated pelvic endometriosis | Severe period pain may coexist |
| Flank pain | Possible ureter obstruction | Kidney imaging may be needed |
Bladder Endometriosis Versus UTI
The two conditions can feel very similar.
A UTI Is More Likely When
- Symptoms begin suddenly
- Urine culture shows bacteria
- There is burning with urination
- Urine smells different
- Fever or chills develop
Bladder Endometriosis Is More Suspicious When
- Symptoms repeatedly worsen around menstruation
- Urine cultures are repeatedly negative
- Severe period pain is also present
- Pelvic endometriosis is already known
- Visible blood in the urine has a menstrual pattern
These are clues, not diagnostic rules.
Bladder Endometriosis Versus Interstitial Cystitis
Interstitial cystitis, also called bladder pain syndrome, can cause:
- Bladder pain
- Urinary urgency
- Frequency
- Pain with bladder filling
These symptoms overlap strongly with bladder endometriosis.
The menstrual pattern, pelvic endometriosis symptoms, imaging findings, and specialist assessment help separate them.
Some people can have both conditions.
Bladder Endometriosis Versus Kidney Stones
Kidney stones can cause:
- Severe flank pain
- Blood in the urine
- Nausea
- Vomiting
- Urinary urgency
Stone pain often comes in intense waves and may travel toward the groin.
It is not usually tied to menstruation.
Bladder Endometriosis Versus Bladder Cancer
Both can cause blood in the urine.
That does not mean bladder cancer is likely in every person with hematuria.
However, visible blood in the urine should never be assumed to be endometriosis without assessment.
Age, smoking history, urine tests, imaging, cystoscopy, and the menstrual pattern all help guide the diagnosis.
How Is Bladder Endometriosis Diagnosed?
Diagnosis begins with a careful history.
Your clinician may ask:
- When urinary symptoms occur
- Whether they follow the menstrual cycle
- Whether blood appears in urine
- Whether urine cultures have been positive
- Whether you have severe period pain
- Whether sex is painful
- Whether you have bowel symptoms
- Whether endometriosis has been diagnosed before
Current endometriosis guidelines support a combination of clinical assessment and imaging rather than assuming surgery is always required merely to make a diagnosis.
Urine Testing
Urine tests help rule out more common causes.
They may include:
- Urinalysis
- Urine culture
- Testing for blood in urine
A normal urine culture does not rule out bladder endometriosis.
Transvaginal Ultrasound
Expert transvaginal ultrasound is one of the key first line tests when deep endometriosis is suspected.
A specialist may look at:
- The bladder wall
- The uterus
- The ovaries
- The ureters
- The bowel
- Other pelvic structures
Ultrasound accuracy depends heavily on the operator's experience with deep endometriosis.
MRI
Pelvic MRI can map deep endometriosis and help define:
- Bladder lesion size
- Depth of involvement
- Relationship to the ureters
- Other pelvic endometriosis
MRI is especially useful when surgery is being planned or ultrasound findings are unclear.
Kidney and Ureter Imaging
This is an important part of urinary tract endometriosis assessment.
Because ureteral obstruction may be silent, a clinician may check:
- Kidney ultrasound
- Ureter appearance
- Hydronephrosis
- Kidney function
Silent kidney damage is one of the main reasons urinary tract endometriosis should be assessed carefully.
When Is Cystoscopy Used?
Cystoscopy uses a thin camera to look inside the bladder.
It may be useful when:
- Blood in the urine is present
- A bladder lesion is suspected
- The lesion may be close to a ureteric opening
- Other bladder disease needs to be excluded
Not every person with suspected bladder endometriosis needs cystoscopy.
Can Bladder Endometriosis Be Missed on a Scan?
Yes.
Small lesions can be difficult to see.
Accuracy also depends on:
- Scanner quality
- Operator experience
- Lesion size
- Lesion location
If symptoms strongly suggest deep endometriosis despite a normal scan, specialist review may still be useful.
How Is Bladder Endometriosis Treated?
Treatment depends on:
- Symptom severity
- Lesion size
- Lesion depth
- Ureter location
- Kidney involvement
- Fertility goals
- Previous treatment
Options can include hormonal treatment or surgery.
Hormonal Treatment
Hormonal therapy aims to suppress the hormonal stimulation that drives endometriosis activity.
Options may include:
- Combined hormonal contraceptives
- Progestogens
- GnRH agonists
- GnRH antagonists in selected settings
Hormonal treatment may reduce pain and urinary symptoms.
It does not physically remove the bladder lesion.
When Is Surgery Considered?
Surgery may be considered when:
- Symptoms are severe
- Hormonal treatment does not help enough
- Hormonal treatment is not suitable
- The lesion is large
- The lesion threatens a ureter
- Urinary obstruction is present
- A definitive tissue diagnosis is needed
What Is a Bladder Shave?
When disease is superficial, a surgeon may remove endometriosis from the outside of the bladder while preserving the deeper bladder wall.
This is sometimes called bladder shaving.
It is suitable only for selected lesions.
What Is Partial Cystectomy?
Partial cystectomy means removing the affected portion of bladder wall and then closing the bladder.
This is commonly used when the lesion extends deeply into the bladder muscle.
A 2022 systematic review found that complete surgical excision usually improved urinary symptoms, although the available evidence was mainly from case series rather than large randomized trials.
Why Is Transurethral Resection Usually Not Enough?
A bladder endometriosis lesion usually grows from the outside of the bladder inward.
A procedure performed only through the urethra may therefore remove the inner portion but leave deeper disease behind.
For this reason, complete excision from the pelvic side is generally preferred when surgery is needed.
Why Might a Urologist Be Involved?
Bladder surgery may be close to:
- The ureters
- The ureteric openings
- Other important urinary structures
Collaboration between a gynecologic endometriosis surgeon and a urologist can be valuable, particularly for complex lesions.
Will You Need a Catheter After Surgery?
Often, yes.
If part of the bladder wall is removed and repaired, a urinary catheter may stay in place while the bladder heals.
The exact length of time depends on the operation and surgeon's protocol.
Can Bladder Endometriosis Come Back?
Yes.
Recurrence is possible after medical or surgical treatment.
A 2022 systematic review found relatively low recurrence of urinary symptoms after surgical excision, but study quality was limited.
Long term follow up may be recommended when disease is extensive.
Can Bladder Endometriosis Affect the Kidneys?
Bladder disease itself does not usually damage the kidneys directly.
The concern is associated ureteral endometriosis.
If a ureter becomes narrowed or blocked, urine can back up into the kidney.
This is called hydronephrosis.
Long standing obstruction can reduce kidney function.
Why Ureter Endometriosis Can Be Silent
Ureteral endometriosis does not always cause obvious urinary symptoms.
Older systematic review data found that many patients had pelvic pain and period pain rather than urinary tract symptoms.
This is why imaging of the ureters and kidneys matters when deep urinary tract disease is suspected.
Can Bladder Endometriosis Cause Recurrent UTIs?
Bladder endometriosis does not necessarily cause bacterial infection.
However, the symptoms can feel almost identical to a UTI.
If symptoms keep returning but urine cultures are negative, another cause should be considered.
Can Bladder Endometriosis Cause Urinary Retention?
It is less common, but deep pelvic endometriosis can affect bladder function.
A 2024 systematic review found that abnormal bladder sensation, voiding dysfunction, and painful bladder filling can occur in people with deep endometriosis.
Not all of these problems come directly from a bladder wall lesion.
Nerve involvement and parametrial disease can also affect bladder function.
Can Bladder Endometriosis Cause Incontinence?
Urinary leakage is not the classic symptom of bladder endometriosis.
However, deep pelvic endometriosis may be associated with bladder dysfunction in some people.
Incontinence has many other common causes and needs its own assessment.
Can Bladder Endometriosis Affect Fertility?
Bladder disease alone does not automatically cause infertility.
However, bladder endometriosis often occurs with other pelvic endometriosis that may involve:
- Ovaries
- Fallopian tubes
- Pelvic adhesions
- Other deep pelvic structures
If pregnancy is a future goal, discuss fertility before major surgery or long term hormonal suppression.
Can Pregnancy Cure Bladder Endometriosis?
No.
Pregnancy changes hormone levels and may temporarily change symptoms.
It does not remove endometriosis lesions or guarantee permanent relief.
Does Hysterectomy Cure Bladder Endometriosis?
No.
Removing the uterus does not automatically remove endometriosis growing in the bladder wall.
Hysterectomy may be part of treatment for selected pelvic conditions, but it is not a stand alone cure for bladder endometriosis.
Can Diet Cure Bladder Endometriosis?
No diet has been proven to remove bladder endometriosis.
A balanced diet may support general health and bowel function, but it should not replace appropriate medical treatment.
Be cautious with claims that eliminating one food can dissolve endometriosis lesions.
Can Drinking More Water Help?
Good hydration supports urinary health.
It can also make concentrated urine less irritating for some people.
However, extra water does not remove a bladder endometriosis lesion.
Drinking excessive amounts can actually worsen urinary frequency.
Does Caffeine Make Symptoms Worse?
Caffeine can increase urinary urgency and frequency in some people.
If your bladder feels sensitive, reducing coffee, energy drinks, or other caffeinated drinks may help symptoms.
This is symptom management, not treatment of the lesion itself.
Can Alcohol Irritate the Bladder?
Some people notice more urgency or bladder discomfort after alcohol.
Keeping a symptom diary can help identify personal triggers.
Pelvic Floor Therapy
Chronic pelvic pain can cause the pelvic floor muscles to become tense and painful.
A pelvic health physiotherapist may help with:
- Muscle relaxation
- Pain management
- Bladder habits
- Pelvic floor coordination
Pelvic floor therapy does not remove endometriosis lesions, but it can be useful for associated muscle pain and bladder dysfunction.
A Symptom Diary Can Help
Record symptoms for several menstrual cycles.
Include:
- Period dates
- Pain with urination
- Urinary frequency
- Urgency
- Blood in urine
- Pelvic pain
- Pain during sex
- Flank pain
- Urine culture results
A clear pattern can make specialist assessment much more useful.
Questions to Ask Your Specialist
- Could my urinary symptoms be bladder endometriosis?
- Have infection and stones been ruled out?
- Do I need expert transvaginal ultrasound?
- Would pelvic MRI help?
- Have my kidneys and ureters been checked?
- Could this be interstitial cystitis instead?
- Would hormonal treatment be reasonable?
- When would surgery be appropriate?
- Is the lesion close to a ureter?
- Should a urologist be involved?
- How could treatment affect fertility?
When Should You Seek Medical Care?
Arrange assessment if you have:
- Recurring painful urination
- Repeated urgency or frequency
- Symptoms that worsen with periods
- Repeated UTI symptoms with negative cultures
- Severe period pain plus urinary symptoms
- Persistent pelvic pain
- Blood in the urine
When Is It Urgent?
Get urgent medical advice for:
- Visible blood in the urine
- Severe flank pain
- Fever with urinary symptoms
- Vomiting
- Difficulty passing urine
- Severe worsening pain
- Possible kidney infection
Do not wait for the next menstrual cycle when symptoms suggest infection or obstruction.
Common Bladder Endometriosis Myths
Myth 1: It Always Causes Blood in the Urine
False.
Many people never develop visible hematuria.
Myth 2: Urinary Symptoms Always Mean a UTI
False.
Bladder endometriosis, interstitial cystitis, stones, and other conditions can cause similar symptoms.
Myth 3: A Normal Urine Culture Rules Out Bladder Disease
False.
A normal culture mainly helps rule out bacterial infection.
Myth 4: Bladder Endometriosis Always Shows on Routine Ultrasound
False.
Detection depends heavily on lesion size and specialist imaging experience.
Myth 5: Hormones Remove the Lesion
False.
Hormonal therapy may suppress symptoms and disease activity but does not surgically remove the nodule.
Myth 6: Hysterectomy Automatically Cures It
False.
The bladder lesion remains unless it is treated directly.
Myth 7: Urinary Tract Endometriosis Is Never Dangerous
False.
Ureteral obstruction can sometimes damage kidney function without causing dramatic symptoms.
Conclusion
Bladder endometriosis is an uncommon but important form of deep endometriosis that can mimic a UTI, overactive bladder, interstitial cystitis, stones, and other urinary conditions.
Common symptoms include painful urination, urinary urgency, frequency, pelvic pain, bladder pressure, and sometimes blood in the urine. A menstrual pattern makes endometriosis more suspicious, but symptoms do not always remain perfectly cyclical.
Diagnosis may involve urine testing, expert transvaginal ultrasound, MRI, kidney and ureter assessment, and cystoscopy in selected cases.
Treatment can include hormonal suppression or surgery. Deep bladder lesions may require complete excision or partial cystectomy, ideally by a team experienced in deep endometriosis and urinary tract surgery.
Your next step is simple: if urinary symptoms repeatedly return, especially around your period or despite negative urine cultures, record the timing and discuss bladder endometriosis with a qualified gynecologist or endometriosis specialist.
References and Sources
- American College of Obstetricians and Gynecologists. Diagnosis of Endometriosis. Clinical Practice Guideline. 2026.
https://www.acog.org/clinical/clinical-guidance/clinical-practice-guideline/articles/2026/03/diagnosis-of-endometriosis - Ferrero S, et al. Bladder Endometriosis: A Systematic Review of Pathogenesis, Diagnosis, Treatment, Impact on Fertility, and Risk of Malignant Transformation.
https://pubmed.ncbi.nlm.nih.gov/28040358/ - Tomasi MC, et al. Symptoms and Surgical Technique of Bladder Endometriosis: A Systematic Review.
https://pubmed.ncbi.nlm.nih.gov/36252916/ - Bladder Endometriosis: What Do We Know and What Is Left to Find Out? 2024.
https://pubmed.ncbi.nlm.nih.gov/39112342/ - A Review of Urinary Tract Endometriosis.
https://pubmed.ncbi.nlm.nih.gov/36048338/ - Surgical Management of Endometriosis Involving the Bladder and Ureter.
https://pubmed.ncbi.nlm.nih.gov/38072247/ - Ureteral Endometriosis: A Systematic Review of Epidemiology, Diagnosis, Treatment and Fertility.
https://pubmed.ncbi.nlm.nih.gov/30165449/
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About the Author
Adel Galal is the founder and editor of NextFitLife. He writes practical consumer health, women's health, nutrition, fitness, and healthy ageing content using information from recognized medical, public health, and academic sources.
I am not a dermatologist, doctor, gynecologist, urologist, pharmacist, or other licensed healthcare professional. This content does not replace professional medical advice. What I share comes from real life experience, extensive research, and consultation with healthcare providers. Always consult qualified medical professionals for diagnosis and treatment of any health condition.
Learn more about NextFitLife, the author, and the site's editorial approach on the About Us page.
Frequently Asked Questions
What is bladder endometriosis?
Bladder endometriosis is endometriosis involving the bladder wall, usually the detrusor muscle. It is a form of deep endometriosis and the most common type of urinary tract endometriosis.
What does bladder endometriosis feel like?
It may cause pain with urination, urgency, frequency, pelvic pressure, lower abdominal pain, bladder pain, or blood in the urine. Symptoms may become worse around menstruation.
Can bladder endometriosis feel like a UTI?
Yes. It can cause burning, urgency, frequency, and bladder discomfort similar to a UTI. Repeated symptoms with negative urine cultures can be a clue that another condition is present.
Can bladder endometriosis cause blood in urine?
Yes. Blood in the urine can occur, especially when a lesion reaches deeper bladder layers. A menstrual pattern can be suggestive, but all visible hematuria should be medically assessed.
How is bladder endometriosis diagnosed?
Diagnosis may include medical history, urine testing, expert transvaginal ultrasound, pelvic MRI, kidney and ureter imaging, and cystoscopy in selected cases.
Can ultrasound detect bladder endometriosis?
Yes. Expert transvaginal ultrasound can identify many bladder endometriosis lesions, but accuracy depends heavily on operator experience and the lesion's size and location.
Can MRI detect bladder endometriosis?
Yes. MRI can help map the size and depth of a bladder lesion and show its relationship to the ureters and other pelvic endometriosis.
How is bladder endometriosis treated?
Treatment may include hormonal suppression or surgery. The choice depends on symptoms, lesion size and depth, ureter involvement, fertility goals, and response to previous treatment.
What surgery is used for bladder endometriosis?
Superficial disease may sometimes be shaved from the bladder surface, while deeper lesions may require complete excision or partial cystectomy.
Can bladder endometriosis damage the kidneys?
Bladder lesions usually do not damage the kidneys directly, but associated ureteral endometriosis can obstruct urine flow and cause hydronephrosis or loss of kidney function if untreated.
Does hysterectomy cure bladder endometriosis?
No. Removing the uterus does not automatically remove endometriosis growing in the bladder wall, so hysterectomy is not a stand alone cure.
Can bladder endometriosis come back after surgery?
Yes. Recurrence is possible, although complete surgical excision can provide durable symptom relief for many patients.
When should urinary symptoms be assessed urgently?
Seek prompt medical care for visible blood in the urine, severe flank pain, fever, vomiting, difficulty passing urine, or rapidly worsening pain.
Health & wellness writer with 30+ years of experience in nutrition, fitness, and healthy aging. Founder of NextFitLife.com — evidence-based health guidance.
