Cancer Survivorship & Post-Op ED

Urologic Side Effects of Radiation

Urologic Side Effects of Radiation

Bladder, bowel-adjacent, and urethral problems that can appear months or years after pelvic radiation, and how they're treated.

Written and reviewed by Shervin Badkhshan, MD · Last reviewed

November 2026

Part of:

After prostate cancer treatment

Office & surgery

Fellowship-Trained Reconstructive Urology

AT A GLANCE

From symptoms to treatment

1. SYMPTOMS

• Urgency, frequency, or bleeding • Pain or burning • Narrowing of the urethra

2. TESTING

• Urine tests and cystoscopy • Imaging when needed

Test result guides →

3. TREATMENT

• Medication and bladder treatments • Treating bleeding • Reconstruction when needed

Surgical options →

Radiation is an effective treatment for prostate, rectal, and bladder cancers. Most men never have lasting urinary problems from it. Some develop side effects months or even years later, because radiation gradually changes the blood supply of the tissue it treats. These problems are treatable, and many men live with them longer than they need to.

Common side effects

  • Bladder irritation and bleeding (radiation cystitis): urgency, frequent urination, bladder pain, and blood in the urine that can come and go.

  • Narrowing: scar tissue can form in the urethra, at the bladder neck, or deeper in the urethra, causing a weak stream or trouble emptying.

  • Leakage: from a weakened sphincter, an overactive bladder, or both.

  • Erection changes: often gradual, over the first 1 to 2 years after treatment.

  • Less common: narrowing of the ureter (the tube from the kidney), or an abnormal connection between the urinary tract and the bowel.

How we evaluate it

  • Urine tests to rule out infection, and a cystoscopy to look inside the bladder and urethra

  • Imaging of the kidneys and bladder

  • A urethrogram or flow test if the stream is weak

Treatment

  • Bladder bleeding: extra fluids and medication for mild cases; cauterizing bleeding vessels with a scope; medications placed into the bladder; and hyperbaric oxygen, which can help irradiated tissue heal.

  • Strictures: radiated tissue heals more slowly, so repair is planned carefully. Urethroplasty and other reconstruction can still work well in the right hands.

  • Leakage: an artificial urinary sphincter is the most common repair after radiation. Urgency leakage is treated separately.

  • Erections: medications, injections, and penile implants all remain options.

When to call right away

Call the office at (516) 535-1900, or go to the nearest emergency room after hours, for:

  • Visible blood with clots, or you can't urinate

  • Fever or chills

  • Urine or air coming from the rectum

Related

Life after prostate cancer treatment · Artificial urinary sphincter · Penile implants

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Your results and questions

Your actual test results, visit notes, and messages with your care team are in your patient portal, the same one you use to book visits. Send questions through the portal or call the office at (516) 535-1900. For anything urgent, call the office or go to the nearest emergency room.