Last updated: May 18, 2026

One of a Urologic emergency condition that we are going to discuss today is an acute urinary retention. The condition is most prevalent and common in male patient rather than the female. So the topic wills mainly focusing on the acute urinary retention in male patients. Typically, it happens in older gentleman who over 60 years and they were the most often group that realized and faced the condition of symptom. The following risks factors below shall have considered while the patients suffering from it;

Acute urinary retention in male: Why this happens to me?
Benign Prostatic Hyperplasia run major cause in Acute Urinary Retention in Male

Urinary retention risk factors

  1. Benign Prostatic Hyperplasia (BPH) – The most common risk factor that the older gentleman cannot be avoided or ignored. It is the enlargement of the prostate gland. Typically, it gradually onset of a poor urinary stream in men who over 50 years old up. The proper treatment from Urologist is capable to minimize the risk of urinary retention in the coming future.
  2. Urethral stricture – Having history of urethral infection, STDs or Endoscopic urological procedure might induce a urethral scarring process which will makes urethral lumen narrowing and finally obstructed.
Urethral stone is one of Acute urinary retention causes
  1. Urethral stone – A rare condition which is occurred by urinary tract stone occluded inside the urethral lumen and that would need an emergency evacuation.
Bladder, Prostate or Urethral infection can cause Urinary Retention
  1. Infections – Bladder infection, prostate infection or urethral infection can make a severe irritation in these areas and as results the acute urinary retention may remain.
Some tablets cause inability to void
  1. Medications – Certain medications can interfere with bladder function. When the causative drug is stopped, acute urinary retention typically resolves.
Constipation is easily modifiable risk factor
  1. Constipation – Stool compacted in the rectum can compress the urethra and obstruct urinary flow, making constipation a surprisingly common and easily correctable cause of urinary retention.
Bed ridden is one of factor which make someone cannot urinate
  1. Limited ambulation – The bladder is controlled by the brain, which typically allows voiding in a quiet, standing position. Patients confined to bed often struggle to urinate and can improve simply by being encouraged to walk and stand.
Neurological problem is considered as complicated issue in Retention of urine
  1. Neurological causes – A complicated condition that should be needed more carefully assessment by Urologist.
  2. Bladder dysfunction – Another rare bladder condition which cannot contract well and end up with full bladder.

An urgent management which we had always performed is the bladder decompression with urethral catheter or suprapubic tube insertion to release a large amount of the urines from the bladder before it becomes rupture. Then the certain treatment will be depended and done by a well-trained Urologist. Patient must be educated about plan of the treatment and the possibility causes of the retention. A few complications after draining a large volume of urine, such as hematuria, should be explained to the patient in advance to prevent unnecessary alarm.

Any questions, you can feel free to discuss with me.

If you or a loved one has experienced acute urinary retention or suspect BPH with worsening urinary symptoms, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Book a Consultation.

Frequently Asked Questions about Acute Urinary Retention in Men

What is acute urinary retention?

Acute urinary retention is a urological emergency in which a person is suddenly unable to urinate despite having a full bladder. It is most common in men over the age of 60 and causes significant pain and discomfort. Immediate treatment with bladder catheterization is required to relieve the obstruction and prevent bladder injury.

What is the most common cause of acute urinary retention in men?

Benign Prostatic Hyperplasia (BPH), or enlargement of the prostate gland, is the most common cause of acute urinary retention in men. As the prostate grows, it gradually compresses the urethra, reducing urinary flow and increasing the risk of complete obstruction. Other causes include urethral stricture, infection, medications, constipation, and neurological conditions.

Can medications cause urinary retention?

Yes. Several drug classes can impair bladder contractility or increase urethral resistance, leading to urinary retention. Common culprits include antihistamines, decongestants, anticholinergics, antidepressants, and opioid pain medications. In many cases, stopping the offending medication resolves the retention without further intervention.

How is acute urinary retention treated?

The immediate treatment is bladder decompression via urethral catheterization or, in some cases, suprapubic tube insertion. This relieves the obstruction and prevents bladder rupture. After decompression, a urologist will investigate the underlying cause and plan definitive treatment, which may include medications, minimally invasive procedures, or surgery depending on the diagnosis.

Is blood in the urine normal after draining a retained bladder?

Yes, mild hematuria (blood in urine) after draining a large volume of retained urine is a known and usually self-limiting complication. It occurs due to sudden decompression of the bladder wall and the release of small mucosal blood vessels. It typically resolves within 24–48 hours with adequate hydration. Your urologist will monitor this and advise if further evaluation is needed.

Disclaimer: This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any medical treatment.

Medically written & reviewed by: Dr. Soarawee Weerasopone (Dr. Pom) — Board-Certified Urologist, Bangkok Hospital Headquarters. International Fellow: Baylor College of Medicine (USA) · Juntendo University (Japan) · Chang Gung Memorial Hospital (Taiwan).

3 Responses

  1. Dear Dr. Pommy, thank you for writing this article. It is exactly what I needed to read today about my dilemma. Praying we can get to Pattaya soon to take care of this problem in me.

    Blessings to you!

    Dr. Stephen Ronzano

    P.S. See you Sunday morning at RPP.

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