Urinary Retention

Overview

Urinary retention is the inability to empty the bladder fully or at all. It comes in two main forms. Acute retention is a sudden, often painful inability to pass urine despite a full bladder, and it is a medical emergency. Chronic retention develops gradually, where the bladder never empties completely, often without severe pain, leading to a constant feeling of fullness, frequent urination, or leaking.

Normal bladder emptying depends on the bladder muscle squeezing while the outlet relaxes, all coordinated by nerves. Retention occurs when there is a blockage to the flow of urine or when the bladder muscle or its nerves are not working properly. The most common cause in men is an enlarged prostate. Because acute retention is uncomfortable and can harm the kidneys, and chronic retention can quietly do the same, both need medical attention.

Common Causes

Urinary retention results from a blockage, a weak bladder muscle, or a nerve problem:

• Prostate enlargement: In men, a benign enlarged prostate (BPH) is the most common cause, narrowing the outlet from the bladder.
• Blockage: Urethral narrowing (stricture), bladder or urethral stones, or, in women, severe pelvic organ prolapse.
• Nerve problems: Diabetes, spinal cord injury or compression, multiple sclerosis, and stroke can impair the signals that empty the bladder.
• Medications: Some cold and allergy medicines, certain antidepressants, and bladder-relaxing drugs can trigger retention.
• After surgery or anesthesia: A common, usually temporary cause.
• Infection or inflammation: Of the urinary tract or, in men, the prostate.

Associated Symptoms

Symptoms vary between the sudden and gradual forms:

• Acute retention: A sudden inability to urinate, severe lower-abdominal discomfort, and a strong urge with a swollen, tender lower belly.
• Chronic retention: A weak or interrupted urine stream, straining to start, a feeling of incomplete emptying, frequent urination (especially at night), and leaking of small amounts of urine.
• Lower abdominal swelling or pressure
• Urinary tract infections that keep coming back

If retention comes with new back pain, leg weakness, or numbness around the buttocks and genitals, it can signal serious nerve compression and is an emergency.

Diagnosis & Evaluation

A clinician will ask about your urine stream, sense of emptying, medications, and any back or nerve symptoms. The exam includes feeling the lower abdomen for a full bladder and, in men, checking the prostate. A simple, important test is a bladder scan or catheter to measure how much urine remains after you try to empty. Further evaluation may include:

• Urine tests for infection
• Blood tests for kidney function and, in men, prostate markers
• Ultrasound of the bladder and kidneys
• Imaging or studies of bladder pressure and flow if the cause is unclear
• Spine imaging if a nerve cause is suspected

Treatment & Management

The first priority in acute retention is to drain the bladder, usually with a catheter, which brings rapid relief. After that, treatment targets the cause:

• Prostate enlargement: Medicines that relax the prostate and bladder outlet or shrink the prostate, and procedures or surgery when needed.
• Blockages: Treating strictures, stones, or prolapse.
• Nerve-related retention: Bladder training, scheduled catheterization that some people do themselves at home, and treating the underlying condition.
• Medication-related retention: Reviewing and adjusting the responsible medicines with your prescriber.
• Infections: Antibiotics for urinary or prostate infections.

Untreated retention can stretch and damage the bladder and back up pressure to the kidneys, so prompt management is important.

When to See a Doctor

Seek emergency care immediately if you suddenly cannot pass urine at all and have a full, painful bladder. Acute urinary retention needs urgent drainage.

See a doctor promptly for ongoing symptoms such as a weak stream, straining, a feeling of incomplete emptying, frequent night-time urination, or leaking, as chronic retention can quietly harm the kidneys. Seek emergency care if difficulty urinating comes with new back pain, leg weakness, or numbness around the buttocks or genitals, which can indicate serious nerve compression.

Self-Care & Prevention

Some causes of retention can be reduced, especially in people at higher risk such as older men:

• Take time to empty the bladder fully and do not rush; some people benefit from urinating a second time a few minutes later (double voiding)
• Do not routinely hold urine for long periods
• Treat constipation, which can press on the bladder outlet
• Review medicines with your prescriber, since some cold, allergy, and other drugs can trigger retention
• Limit alcohol, especially before situations where a toilet is not handy
• If you have an enlarged prostate, follow your treatment plan to reduce the risk of a sudden episode

If you are at risk, knowing the warning signs of acute retention and seeking help quickly protects your bladder and kidneys.

Related Topics

Frequently Asked Questions

References

1. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Urinary Retention.
2. Mayo Clinic. Urinary retention.
3. MedlinePlus, U.S. National Library of Medicine. Urination difficulties.
4. Urology Care Foundation.