What is Urinary Retention?
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Urinary retention is the inability to fully empty the bladder. Acute retention, a sudden inability to urinate despite a painful, full bladder, needs emergency care, while chronic retention causes trouble starting urination and a weak stream. It is most often caused by an enlarged prostate in men but also by nerve problems, medications or surgery. Treatment relieves the blockage.
What the research says
Alpha-blockers raise the chance of urinating again after a catheter is removed. A network meta-analysis of 13 randomised trials in men with acute urinary retention caused by an enlarged prostate found that alfuzosin, silodosin, tamsulosin, and alfuzosin plus tamsulosin each gave significantly higher success rates for a trial without catheter than placebo, while doxazosin did not (Gwon et al., Prostate International, 2023). [2]
There is no proven best time to try removing the catheter. A systematic review of 61 studies in men catheterized for acute urinary retention compared immediate and delayed trials without catheter. In two randomised trials (174 participants), the relative success rate was 1.22 (95% CI 0.84 to 1.76) favouring delayed removal, and the authors concluded the evidence favours neither approach (Christensen et al., BJUI Compass, 2024). [3]
Retention after joint replacement surgery is common, and some people are at higher risk. A meta-analysis of 29 studies (3,273 patients with and 11,583 without retention) found a pooled incidence of postoperative urinary retention of 28.06% after hip and knee replacement. Risk was higher with male sex (odds ratio 1.81, 95% CI 1.26 to 2.59), a history of enlarged prostate (odds ratio 1.99, 95% CI 1.41 to 2.83), and spinal anaesthesia (odds ratio 1.44, 95% CI 1.19 to 1.74) (Azarboo et al., Bone & Joint Open, 2024). [4]
Key Takeaways
Feature | Details |
Primary Definition | The inability to completely or partially empty the bladder. |
Acute Form | Sudden inability to pee; considered a medical emergency. |
Chronic Form | Gradual symptoms like weak stream or frequent leaking. |
Main Causes | Blockages (BPH), nerve damage, medications, and infections. |
Commonly Affected | Men aged 70+, though anyone can be affected. |
Risk of Delay | Can lead to permanent bladder damage or kidney failure. |
Primary Treatment | Catheterization for immediate relief; surgery or meds for long-term. |
What is urinary retention?
The bladder functions as a storage tank for urine, which is the waste product filtered by the kidneys. Under normal circumstances, when the bladder is full, the brain signals the bladder muscles to squeeze while the sphincter muscles relax, allowing urine to exit through the urethra. Urinary retention disrupts this process, preventing the bladder from emptying. This condition is categorized into two distinct types: acute and chronic. [1]
Acute urinary retention occurs suddenly and can be extremely painful. A person may feel a desperate need to urinate but find it impossible to pass any urine at all. Because this can lead to severe abdominal pain and potential bladder rupture, it is treated as a medical emergency. Chronic urinary retention, on the other hand, develops over time. Symptoms are often mild at first, such as a slow start to urination or a weak stream, but they persist and can eventually lead to significant complications if ignored.
What are the symptoms and warning signs of urinary retention?
The signs of urinary retention depend heavily on whether the condition is sudden or long-term. Recognizing these symptoms early is critical for preventing permanent damage to the urinary system.
Acute Symptoms (Emergency)
Chronic Symptoms (Gradual)
Difficulty Starting: Straining or waiting a long time for the urine stream to begin. [1]
Weak Stream: The flow of urine is slow, stops and starts, or lacks pressure. [1]
Frequency and Urgency: Feeling the need to pee immediately after finishing, or waking up multiple times at night (nocturia). [1]
Dribbling or Leaking: Accidental loss of urine (incontinence) because the bladder is constantly overfilled. [1]
What are the common causes of urinary retention?
Urinary retention is rarely a standalone disease; rather, it is usually a symptom of an underlying issue. These causes generally fall into four main categories: blockages, nerve problems, medications, and infections. [1]
Physical Blockages
The most common cause, especially in men, is Benign Prostatic Hyperplasia (BPH), where an enlarged prostate gland squeezes the urethra. Other blockages include:
Nerve and Communication Issues
The brain must communicate effectively with the bladder to coordinate urination. Conditions that disrupt these signals include:
Medications and Surgery
Many common drugs can interfere with the bladder's ability to contract. These include antihistamines, certain antidepressants, and opioid pain relievers. Additionally, surgery—particularly joint replacements or spinal procedures—can cause temporary retention due to the effects of general anesthesia or local inflammation. [1]
How is urinary retention diagnosed and managed?
To diagnose urinary retention, healthcare providers often use a Post-Void Residual (PVR) test, which measures how much urine remains in the bladder after a person tries to pee. This can be done via ultrasound or a temporary catheter. Further tests, such as a cystoscopy (looking inside the bladder with a camera) or urodynamic studies (measuring bladder pressure), may be used to find the exact cause.
What are the treatment options for urinary retention?
The goal of treatment is to empty the bladder and address the root cause of the retention.
Treatment Type | Description |
Catheterization | Inserting a thin tube to drain the bladder; provides immediate relief for acute cases. |
Medications | Alpha-blockers to relax prostate muscles or antibiotics to clear infections. |
Surgery | Procedures to shrink the prostate (TURP), repair strictures, or lift prolapsed organs. |
Nerve Therapy | Using electrical pulses (neuromodulation) to help the brain and bladder communicate. |
Behavioral Changes | Scheduled voiding, double voiding, and pelvic floor exercises to improve muscle control. |
Conclusion
Urinary retention is a serious condition that requires proactive management. While the sudden inability to urinate is a clear emergency, the gradual symptoms of chronic retention should not be dismissed as a normal part of aging. Early intervention can prevent infections, bladder stones, and permanent kidney damage. If you or a loved one are experiencing difficulty with bladder emptying, consult a urologist to determine the best path toward recovery.
For more resources and visual guides on managing health conditions, explore Rinnit's infographic templates.
Frequently Asked Questions
What is the most common cause of urinary retention in men?
An enlarged prostate (BPH) is the leading cause.
Is urinary retention always an emergency?
Only the acute form (sudden inability to pee) is an emergency.
Can women get urinary retention?
Yes, though it is less common and often caused by pelvic organ prolapse or nerve issues.
Can medications cause me to stop peeing?
Yes, antihistamines, antidepressants, and opioids are common culprits.
What happens if urinary retention is left untreated?
It can lead to UTIs, bladder damage, and chronic kidney disease.
How is the bladder drained in an emergency?
A healthcare provider will use a catheter to drain the urine.
What is "double voiding"?
It is a technique where you pee, wait a minute, and then try to pee again to ensure the bladder is empty.
Can stress cause urinary retention?
While rare, severe anxiety can sometimes lead to "shy bladder" or muscle tension that interferes with flow.
Does drinking less water help?
No, dehydration can actually irritate the bladder and lead to infections.
Is surgery always required?
No, many cases are managed with medication or behavioral changes.
What is a urethral stricture?
It is narrowing of the urethra caused by scar tissue from injury or infection.
Can a UTI cause urinary retention?
Yes, the resulting swelling can block the flow of urine.
What is nocturia?
It is the need to wake up multiple times during the night to urinate.
How does diabetes affect the bladder?
Long-term high blood sugar can damage the nerves that signal the bladder to empty.
What is a post-void residual (PVR) test?
A test to see how much urine stays in your bladder after you pee.
Can general anesthesia cause retention?
Yes, it often temporarily "sleeps" the bladder muscles.
What are alpha-blockers?
Medications that relax the muscles in the prostate and bladder neck.
Can pelvic floor exercises help?
Yes, they can improve the coordination of the muscles used for urination.
What is a cystocele?
A condition where the bladder drops into the vaginal space.
Is urinary retention painful?
Acute retention is very painful; chronic retention may just feel like pressure or discomfort.
Can constipation cause urinary retention?
Yes, a full rectum can press against the bladder and urethra.
What is neuromodulation?
A treatment that uses mild electrical pulses to improve nerve signals to the bladder.
How long does acute urinary retention last?
It persists until the bladder is drained by a professional.
Can I use a catheter at home?
Some patients with chronic issues are taught "self-catheterization."
What is the prostate?
A small gland in men that surrounds the urethra.
Can bladder stones cause retention?
Yes, they can act like a plug at the bladder exit.
Is urinary retention hereditary?
The underlying causes, like BPH or certain nerve conditions, can have a genetic component.
What is the difference between retention and incontinence?
Retention is the inability to empty; incontinence is the inability to hold urine.
Can an STI cause retention?
Yes, if the infection causes significant urethral swelling.
What is urodynamic testing?
A series of tests that measure how well the bladder holds and releases urine.
Can a herniated disk cause bladder issues?
Yes, if it presses on the nerves in the lower spine.
What is the urethra?
The tube that carries urine from the bladder out of the body.
Can antihistamines like Benadryl be dangerous for the bladder?
In people already prone to retention, they can trigger an acute episode.
How does a urologist check the prostate?
Usually through a digital rectal exam (DRE).
What is TURP?
Transurethral Resection of the Prostate, a common surgery to treat BPH.
Can kidney stones cause urinary retention?
Usually not, unless the stone moves into the bladder and blocks the exit.
Is it normal to pee less as you age?
Frequency may change, but the inability to empty is never normal.
Can a catheter cause an infection?
Yes, long-term catheter use increases the risk of UTIs.
What is "overflow incontinence"?
Leaking that happens because the bladder is too full to hold any more.
Can pregnancy cause retention?
Yes, due to hormonal changes or the physical weight of the uterus.
What is a rectocele?
When the rectum sags into the vaginal wall, potentially blocking the urethra.
Can muscle relaxants cause retention?
Yes, they can prevent the bladder muscle from contracting strongly enough.
Is there a natural cure for urinary retention?
While some lifestyle changes help, medical evaluation is necessary.
How much urine does a normal bladder hold?
About 300-400ml (roughly 1.5 to 2 cups).
What is the sphincter?
The circular muscle that stays closed to keep urine in the bladder.
Can a stroke affect urination?
Yes, by damaging the brain's control center for the bladder.
Is acute urinary retention fatal?
If left for a long time, it can cause kidney failure or bladder rupture, which are life-threatening.
Can I prevent urinary retention?
Managing BPH and avoiding certain medications can reduce the risk.
What is a suprapubic catheter?
A tube inserted through the skin of the abdomen directly into the bladder.
Who should I see for bladder problems?
A urologist is the specialist for these conditions.
Related Articles
Related Reading
Urinary Catheter: Types, Placement, Care and Risks explains urinary catheter types, placement and care.
Learn more in our guide to Credé Maneuver: How to Do It, Who Should Avoid It and Safer Alternatives.
Learn more in our guide to Bladder Ultrasound: Why It's Done, How to Prepare and What Results Mean.
Post-Void Residual (PVR) Test: How It's Done, Normal Levels and High PVR explains the test that measures urine left in the bladder after peeing.
References
Cleveland Clinic. Urinary Retention. Cleveland Clinic Health Library. Last updated January 23, 2024. https://my.clevelandclinic.org/health/diseases/15427-urinary-retention
Gwon YN, Park JJ, Yang WJ, et al. Comparing effects of alpha-blocker management on acute urinary retention secondary to benign prostatic hyperplasia: a systematic review and network meta-analysis. Prostate Int. 2023;11(2):91-99. PMID 37409094. https://doi.org/10.1016/j.prnil.2022.12.002
Christensen VS, Skow M, Flottorp SA, et al. Immediate or delayed trial without catheter in acute urinary retention in males: a systematic review. BJUI Compass. 2024;5(8):732-747. PMID 39157169. https://doi.org/10.1002/bco2.369
Azarboo A, Ghaseminejad-Raeini A, Teymoori-Masuleh M, et al. Risk factors of postoperative urinary retention following total hip and knee arthroplasty. Bone Joint Open. 2024;5(7):601-611. PMID 39022904. https://doi.org/10.1302/2633-1462.57.BJO-2024-0003.R1
Disclaimer
The information provided in this article is for educational purposes only and is not intended as medical advice. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read in this article.
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