Urine retention means your bladder is unable to empty properly. If you suddenly cannot pass urine, have severe lower abdominal pain, a painful full bladder or swelling below the navel, it can be a urology emergency. Do not wait at home. The first treatment is usually urgent bladder drainage with a urinary catheter. After pain relief, the urologist checks the cause — commonly prostate enlargement, urethral stricture, stone, blood clot, infection, medicine side effect or nerve-related bladder weakness. Acute urinary retention needs urgent medical care.

What is urine retention?

Urine retention, also called urinary retention, means urine remains inside the bladder because it cannot come out fully or at all.

There are two main types:

In acute retention, the patient is usually very uncomfortable and needs urgent drainage. In chronic retention, the person may still pass urine, but a significant amount may remain inside the bladder after urination.

Is urine retention dangerous?

Yes, it can be dangerous.

Sudden painful urine retention needs urgent care because the bladder is overfilled and urine cannot drain. Draining the bladder with a catheter helps relieve pain and helps protect the bladder and kidneys from damage.

Chronic urine retention can also cause repeated urinary infections, overflow leakage, bladder stones, kidney swelling or kidney function problems if ignored. It may cause few or no symptoms, which is why testing is important when poor bladder emptying is suspected.

Symptoms of acute urine retention

Common symptoms include:

• No urine despite a strong urge.
• Severe lower abdominal pain.
• Repeated unsuccessful attempts to urinate.
• Swelling or tightness below the navel.
• Restlessness, sweating or distress due to pain.
• Only drops of urine despite a full bladder.

This is different from ordinary burning urination or frequency. In acute retention, the main problem is that urine is blocked or not draining.

Symptoms of chronic urine retention

Chronic retention can be silent in the beginning. Symptoms may include:

• Weak urine flow.
• Difficulty starting urine.
• Straining to pass urine.
• Feeling that urine is still left after finishing.
• Frequent urination in small amounts.
• Night-time urination.
• Leakage without warning, sometimes due to overflow.
• Recurrent urine infection.
• Lower abdominal heaviness.
• Raised creatinine or kidney swelling on ultrasound.

A person may feel they are passing urine normally because some urine comes out. But a large amount may still be left behind in the bladder.

Common causes of urine retention

Urine retention usually happens due to either blockage or weak bladder contraction. Blockage may occur at the bladder outlet or urethra, while bladder weakness may occur due to nerve or muscle problems.

1. Enlarged prostate

In older men, benign prostate enlargement is a common cause. The prostate surrounds the urine passage. When it enlarges, it can squeeze the passage and reduce urine flow.

Warning signs before retention may include weak stream, frequent urination, night-time urination, urgency, straining and incomplete emptying.

2. Urethral stricture

A urethral stricture is narrowing of the urine pipe due to scar tissue. It can happen after infection, trauma, previous catheterisation, endoscopic procedures or injury.

Possible clues include very slow urine flow, spraying of urine, straining, recurrent infection, previous catheter difficulty or a history of urethral procedure.

3. Stone, blood clot or tumour

A bladder stone, urethral stone, blood clot or tumour can block urine flow. Retention with visible blood in urine should not be ignored because it may need urgent evaluation.

4. Urinary infection or prostatitis

Urinary infection can cause swelling, pain and difficulty passing urine. In men, acute prostatitis can cause fever, burning urine, pelvic pain and urine retention.

Fever with retention needs urgent medical care.

5. Medicine side effects

Some medicines can trigger or worsen urine retention, especially in men with prostate enlargement. These may include some cold tablets, allergy medicines, decongestants, antidepressants, antipsychotics, opioids and muscle relaxants.

Medicine review is important. NICE recommends reviewing prescription, herbal and over-the-counter medicines when assessing urinary symptoms in men.

6. Nerve-related bladder weakness

The bladder needs proper nerve signals to contract and empty. Diabetes, spine problems, spinal injury, stroke, Parkinson’s disease, multiple sclerosis, pelvic surgery and some neurological conditions can affect bladder emptying.

In these cases, treatment is not only about removing blockage. Bladder muscle function may also need assessment.

7. After surgery or anaesthesia

Urine retention can happen after surgery, spinal anaesthesia, general anaesthesia, pain medicines or prolonged bed rest. It may be temporary, but repeated or persistent retention needs urology evaluation.

Urine retention treatment: what happens first?

The first treatment for painful acute urinary retention is usually urgent bladder drainage.

Urinary catheter

A soft tube called a urinary catheter is inserted through the urine passage into the bladder. This drains urine and usually gives quick pain relief.

In acute urinary retention, medical guidance recommends immediate bladder drainage with a catheter to relieve pain and help prevent bladder and kidney damage. NICE also recommends immediate catheterisation for men with acute retention.

Suprapubic catheter

Sometimes a catheter cannot be passed safely through the urine passage. This may happen in severe urethral stricture, urethral trauma, false passage or difficult anatomy.

In such cases, a suprapubic catheter may be placed directly into the bladder through the lower abdomen. EAU nursing guidance lists acute or chronic retention that cannot be adequately drained through a urethral catheter as an indication for suprapubic catheterisation.

Going home with a catheter

Some patients go home with a catheter for a few days before reassessment. Proper catheter care is important to reduce blockage, infection and accidental pulling.

When can the catheter be removed?

Catheter removal depends on the cause of urine retention.

In prostate-related retention, the urologist may start medicines and plan a trial without catheter after a few days. This means the catheter is removed under advice, and the patient is observed to see whether they can pass urine properly.

Catheter removal may fail if:

• Prostate blockage is severe.
• Bladder muscle is weak.
• Infection is active.
• Urethral stricture is present.
• Large residual urine remains.
• There is blood clot, stone or tumour.

If retention repeats, further treatment or surgery may be needed.

Tests after urine retention is relieved

Once the emergency is controlled, the important question is: why did retention happen?

Tests may include:

• Urine routine and urine culture to check infection.
• Serum creatinine/eGFR to assess kidney function.
• Ultrasound KUB with prostate and post-void residual to check kidneys, bladder, prostate size and urine left behind.
• Uroflowmetry to measure urine speed and pattern.
• Digital rectal examination in men to assess the prostate.
• PSA test when appropriate.
• Cystoscopy to see the urethra, prostate channel and bladder from inside.
• RGU/MCU if urethral stricture is suspected.
• Urodynamic study if bladder weakness or neurogenic bladder is suspected.

NICE recommends specialist assessment for men with urinary symptoms complicated by retention, recurrent or persistent UTI, suspected kidney impairment or suspected urological cancer. It also recommends flow-rate and post-void residual measurement during specialist assessment.

Treatment after catheter drainage

Treatment depends on the cause.

If prostate enlargement is the cause

Treatment may include:

• Prostate medicines.
• Trial without catheter.
• Monitoring of urine flow and residual urine.
• Surgery if retention recurs or medicines fail.

Surgery options may include TURP, bipolar TURP, laser prostate surgery or HoLEP, depending on prostate size, health condition and available facilities.

If urethral stricture is the cause

Treatment may include:

• Temporary catheter or suprapubic catheter.
• Dilatation or DVIU in selected short strictures.
• Urethroplasty for recurrent, long or complex strictures.

Repeated dilatations are not always the best long-term solution. A proper stricture assessment helps choose the right treatment.

If infection is the cause

Urine culture helps guide antibiotics. Fever with retention needs urgent care because infection can spread.

If medicine triggered retention

The doctor may stop, change or adjust the triggering medicine. Do not stop important heart, BP, psychiatric, diabetes or pain medicines without medical advice.

If bladder weakness is the cause

Some patients need intermittent self-catheterisation, urodynamic testing, diabetes control, neurology evaluation or a long-term bladder management plan.

What is normal after catheter placement?

Some symptoms can happen after catheterisation:

• Mild burning.
• Mild bladder spasm.
• Slight blood staining.
• Discomfort around the catheter.
• Urine draining into the bag.

Contact a doctor urgently if:

• Fever or chills develop.
• Urine stops draining into the bag.
• Severe pain continues.
• Urine becomes thick red with clots.
• Catheter comes out accidentally.
• There is swelling or severe leakage around the catheter.
• You feel weak, drowsy or very unwell.

Can urine retention come back?

Yes. Urine retention can come back if the underlying cause is not treated.

Recurrence is more likely when there is:

• Large prostate obstruction.
• Urethral stricture.
• Bladder stone.
• Recurrent infection.
• Long-standing diabetes with bladder weakness.
• Previous failed catheter removal.
• High post-void residual urine.
• Blood clots or tumour-related blockage.

That is why catheterisation should be followed by proper urology evaluation.

What to bring for consultation

Bring these reports if available:

• Emergency notes or discharge summary.
• Catheterisation details and amount of urine drained, if known.
• Current medicines, including cold, allergy, sleep and pain medicines.
• Urine routine report.
• Urine culture report.
• Serum creatinine/eGFR.
• USG KUB/prostate/PVR report.
• PSA report, if done.
• Uroflowmetry report, if done.
• Cystoscopy report, if done.
• RGU/MCU report if stricture is suspected.
• CT scan report if stone, clot or tumour is suspected.
• Diabetes, BP, spine or neurological records.

FAQs

Related reading

• Weak Urine Flow in Men: Causes and Treatment
• Difficulty Passing Urine: Causes and Treatment
• Blood in Urine: Causes and When to See a Urologist
• Catheter Care at Home: Patient Guide
• Urine Culture Test Explained
• Paraphimosis: A Foreskin Emergency That Needs Urgent Treatment
• Urologist in Latur

References

• National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Urinary Retention https://www.niddk.nih.gov/health-information/urologic-diseases/urinary-retention/symptoms-causes
• National Institute of Diabetes and Digestive and Kidney Diseases. Treatment of Urinary Retention https://www.niddk.nih.gov/health-information/urologic-diseases/urinary-retention/treatment
• NICE Clinical Guideline CG97. Lower urinary tract symptoms in men: management https://www.nice.org.uk/guidance/cg97/chapter/Recommendations
• EAU Nurses. Indwelling catheterisation in adults — urethral and suprapubic https://nurses.uroweb.org/guidelines/indwelling-catheterisation-in-adults-urethral-and-suprapubic/chapter/alternatives-indications-and-contraindications