Urethral Stricture — Causes, Symptoms, Diagnosis & Treatment Guide — Symptoms, Causes & Treatment | MyMedicPlus

Urethral stricture is a narrowing of the urethra — the tube that carries urine from the bladder to the exterior — resulting from fibrosis and spongiofibrosis (scarring of the corpus spongiosum surrounding the male urethra). Strictures are predominantly a male condition due to the length of the male urethra (approximately 15-20 cm), which traverses the penis and perineum and is susceptible to injury. The condition causes obstructive lower urinary tract symptoms (LUTS) — reduced urinary stream, straining to void, prolonged voiding, incomplete bladder emptying, urinary retention, recurrent urinary tract infections, and — in severe cases — upper urinary tract dilation and renal impairment from chronic urinary obstruction. The urethra is divided into anterior (pendulous/penile and bulbar segments) and posterior (membranous and prostatic) sections. Anterior urethral strictures are most common and are managed by the reconstructive urologist. Posterior urethral disruption injuries (from pelvic fractures) are a distinct entity. Stricture prevalence is estimated at 200-600 per 100,000 men, increasing with age. The condition is associated with significant quality of life impairment — urinary dysfunction, sexual dysfunction (reduced ejaculatory force, haematospermia), and anxiety regarding recurrence after treatment.

Urethral strictures arise from injury to the urothelium and underlying corpus spongiosum, triggering fibroblast activation, collagen deposition, and progressive spongiofibrosis. Causes vary by anatomical location and patient demographics. Iatrogenic (instrumentation) — the most common cause in high-income countries (45-50%): urethral catheterisation, cystoscopy, transurethral resection of the prostate (TURP), urethral calculi manipulation, and prolonged urethral catheter use; particularly the bulbar and navicular fossae (at the urethral meatus) are susceptible to catheter-related trauma. Trauma (15-25%): blunt perineal trauma (straddle injury — falling astride a hard surface — particularly damages the bulbar urethra); pelvic fractures cause posterior urethral injury from shear at the membranous urethra. Infection (10-15%): untreated or recurrent gonococcal urethritis (Neisseria gonorrhoeae — gonococcal stricture) was historically the most common cause globally and remains significant in low-income countries; non-gonococcal urethritis (Chlamydia trachomatis) contributes. Lichen sclerosus (balanitis xerotica obliterans — BXO): a chronic inflammatory dermatological condition affecting the penile skin, foreskin, and urethral meatus causing progressive meatal stenosis and anterior urethral strictures; responsible for approximately 15% of strictures, predominantly in the penile urethra; recurrence after surgical repair is particularly high if BXO is not addressed. Idiopathic: no identifiable cause in 15-20% of patients.

The predominant symptom is a reduced or slow urinary stream — often the first complaint patients notice. Other obstructive voiding symptoms: hesitancy (difficulty initiating micturition), straining to void, intermittent flow, prolonged voiding time, post-void dribbling, and a sensation of incomplete bladder emptying. Irritative symptoms (from secondary bladder instability from chronic bladder outflow obstruction): urinary frequency, nocturia (waking to void at night), and urgency. Acute urinary retention (complete inability to void — a urological emergency requiring emergency urethral catheterisation or suprapubic catheter) may be the first presentation in some patients. Recurrent urinary tract infections (UTIs): incomplete bladder emptying creates a reservoir for bacterial colonisation — recurrent UTIs in men should always prompt urethral and prostate evaluation. Urinary tract infections ascending to the kidneys (pyelonephritis), epididymo-orchitis (Fournier's gangrene in severe cases — necrotising perineal infection), and, with chronic severe obstruction, hydroureteronephrosis and progressive renal impairment. Sexual dysfunction: reduced ejaculatory stream force and volume (from reduced urethral lumen); post-ejaculatory dysuria; haematospermia (blood in semen); and erectile dysfunction (from perineal trauma, anxiety, or associated vascular injury) may coexist.

Uroflowmetry: a non-invasive screening test — reduced peak flow rate (Qmax below 15 mL/s in a voided volume above 150 mL) and a plateau-shaped flow curve suggest bladder outflow obstruction from a stricture; however, it cannot distinguish a stricture from BPH or detrusor underactivity. Post-void residual (PVR) volume: measured by bladder ultrasound scan; elevated PVR (above 100-200 mL) indicates chronic urinary retention from obstruction. Retrograde urethrogram (RUG): the primary radiological investigation — contrast medium injected retrogradely via the urethral meatus; provides clear imaging of stricture location, length, and number; standard in pre-operative planning; combined with voiding cystourethrogram (VCUG) provides full assessment of stricture and bladder. Cystoscopy (flexible): direct visualisation of the urethra under local anaesthetic — identifies stricture location, severity, and mucosal appearance; reveals lichen sclerosus changes (pale, scarred meatal tissue); allows biopsy of suspicious lesions. Ultrasound urethrography (urethral ultrasound with saline instillation): increasingly used to assess spongiofibrosis depth and extent (particularly for planning substitution urethroplasty) — greater tissue detail than fluoroscopic RUG. MRI urethrography: provides detailed assessment of complex strictures and periurethral tissues. Renal ultrasound: assesses upper urinary tract dilation if significant retention or UTI history.

Treatment depends on stricture location, length, aetiology, and previous treatment history. Urethral dilation: sequential passage of graduated dilators (or balloon dilation) to expand the stricture lumen; provides temporary symptomatic relief but does NOT treat the underlying fibrosis — recurrence rate approaches 70-80% within 3 years; recommended only as short-term palliation in men unsuitable for surgery, or for meatal stenosis; self-catheterisation (intermittent self-dilation — ISD) with a catheter 2-3 times weekly can slow stricture recurrence and is used in non-surgical candidates. Direct vision internal urethrotomy (DVIU): endoscopic incision of the stricture under direct vision using a cold knife or laser, followed by 6-week urethral catheterisation; suitable for short (below 1-1.5 cm), non-dense, primary bulbar urethral strictures — success rate approximately 60-70% for first DVIU; recurrence rates climb steeply with repeat procedures (second DVIU — success below 20%). Urethroplasty (open surgical repair): the gold standard and most durable treatment for urethral stricture. Two main types: anastomotic urethroplasty (excision of the short dense bulbar stricture and end-to-end anastomosis — success rates above 90% at 5 years for bulbar strictures); substitution urethroplasty using buccal mucosa graft (BMG — harvested from the inner cheek, used to augment or replace the narrowed urethra in long strictures or those not amenable to anastomotic repair — success rates 80-90% at 5 years; buccal mucosa is the preferred graft material due to its hairlessness, resistance to wetting, and good vascularisation). Perineal urethrostomy: permanent perineal opening for the urethra — an option for complex recurrent strictures not amenable to repair. Lichen sclerosus management: concurrent treatment with topical or intralesional corticosteroids (clobetasol propionate 0.05%), careful surveillance, and avoidance of penile skin as graft material.

Untreated or inadequately managed urethral stricture causes progressive urinary obstruction with multiple serious downstream complications. Chronic urinary retention — incomplete bladder emptying due to outflow obstruction — leads to bladder trabeculation, diverticulum formation, and ultimately detrusor muscle failure (acontractile bladder) from chronic overdistension. Recurrent urinary tract infections from incomplete bladder emptying and urinary stasis occur in the majority of patients with significant stricture disease; ascending infection can cause epididymo-orchitis and prostatitis. Bladder stones form from crystallisation of urinary solutes in chronically residual urine; their presence further worsens bladder function and infection risk. Upper urinary tract damage — hydronephrosis (dilatation of the renal collecting system), hydroureter, and ultimately chronic renal failure — occurs from back-pressure effects if obstruction is complete or near-complete and prolonged without treatment. Urinary fistula (a pathological channel connecting the urethra to adjacent structures such as the scrotum, perineum, or rectum) can develop from severe untreated stricture disease, particularly post-inflammatory or post-traumatic cases. Recurrence after treatment — particularly urethroplasty by direct vision internal urethrotomy (DVIU) — is common for longer strictures and requires long-term urological surveillance with uroflowmetry and post-void residual assessment.

Preventing iatrogenic strictures: gentle urethral catheterisation technique with appropriate lubrication (instillagel — lignocaine gel); use of the smallest appropriate catheter size (Fr 14-16 for adults); prompt catheter removal to minimise time of catheter indwelling; using suprapubic catheters for long-term drainage when prolonged catheterisation is anticipated (avoids urethral pressure necrosis); and using smallest-calibre cystoscopes. Treating STIs promptly: early antibiotic treatment of urethritis (Chlamydia and gonorrhoea) prevents ascending infection and urethral scarring — gonococcal urethritis was treated with ceftriaxone 1 g IM plus azithromycin 1 g orally (now ceftriaxone 1 g alone due to resistance); all sexual contacts should be treated. Safe sexual practice and regular STI screening reduces urethral infection. After urethroplasty: uroflowmetry at 3, 12, and 24 months post-operatively to detect early recurrence — stricture recurrence after urethroplasty is typically identified at the anastomotic line and is treatable with DVIU if caught early.

Seek emergency care immediately (999/911 or A&E) for: complete inability to pass urine (acute urinary retention) — a urological emergency requiring emergency catheterisation; severe lower abdominal pain or bladder distension with inability to void. See a GP urgently for: progressively weakening urinary stream over weeks to months; significant straining to void or prolonged voiding times; recurrent urinary tract infections (in men, UTIs should always prompt investigation of the lower urinary tract including prostate and urethra — they are not common in healthy men); or haematuria (blood in urine). Patients who have previously had urethral instrumentation, urethral trauma, or gonorrhoea and develop obstructive voiding symptoms should specifically mention this history to their GP, as these are the highest-risk groups for stricture. Symptoms of urethral stricture can mimic benign prostatic hyperplasia (BPH) in older men — correct diagnosis (and distinguishing the two) is essential as treatments differ completely.