Urethral Stricture — Symptoms, Causes & Treatment | MyMedicPlus

Urethral stricture is an abnormal narrowing of the urethral lumen caused by scar tissue (fibrosis and spongiofibrosis — replacement of normal urethral spongiosum tissue with dense collagen fibrosis) resulting from inflammation, infection, trauma, or iatrogenic injury to the urethral mucosa or underlying corpus spongiosum. The stricture reduces the effective cross-sectional area of the urethral lumen, increasing urethral resistance and thereby generating the characteristic obstructive lower urinary tract symptoms (LUTS). Urethral strictures occur predominantly in men — the male urethra (approximately 20 cm) is vastly longer and more anatomically complex than the female urethra (3-4 cm), making it far more vulnerable to stricture formation from infection, instrumentation, and trauma. The male-to-female stricture ratio is approximately 10:1. The male urethra is anatomically divided into the anterior urethra (from the external meatus to the external urethral sphincter: penile/fossa navicularis, bulbar, and membranous segments) and the posterior urethra (prostatic and membranous — the segment from the bladder neck through the prostate to the external sphincter). The bulbar urethra is the most commonly affected segment — accounting for approximately 40-50% of all strictures — followed by the penile urethra (30-35%) and posterior urethra (from pelvic fracture injury). Stricture severity is classified by uroflowmetry Qmax (maximum urinary flow rate) and imaging length: short strictures (below 2 cm) in the bulbar urethra respond well to direct vision internal urethrotomy (DVIU) if untreated before; longer, recurrent, or complex strictures require urethroplasty for durable cure. Untreated urethral stricture progressively worsens over years, leading to bladder dysfunction (detrusor hypertrophy, diverticulum formation, trabeculation), chronic urinary retention, recurrent urinary tract infections (ascending infection in the obstructed system), hydronephrosis, and progressive chronic kidney disease from bilateral upper tract obstruction — making early diagnosis and definitive treatment essential.

Iatrogenic causes (the most common aetiology in high-income countries — approximately 30-40% of all strictures): urethral catheterisation (Foley catheter placement — particularly repeated or prolonged catheterisation using larger French sizes without adequate lubrication; the balloon inflation at the bulbar urethra rather than the bladder is a common cause of traumatic stricture); flexible or rigid cystoscopy (endoscopic urethral instrumentation — the most common office urological procedure causing iatrogenic stricture); transurethral resection of the prostate (TURP) — the resectoscope sheath causes external sphincter or bulbar urethral injury; hypospadias repair (childhood urethral reconstruction — an important cause of complex penile strictures in adulthood); and radiation therapy for prostate, bladder, or rectal cancer causing progressive radiation-induced urethral fibrosis appearing months to years after treatment. Infective causes (the most common aetiology globally and in low-income countries): gonococcal urethritis (Neisseria gonorrhoeae — the historically predominant cause worldwide, causing a severe urethritis with mucopurulent discharge, followed by urethral scarring particularly in the bulbar urethra in inadequately treated or recurrent infections; still the leading cause in sub-Saharan Africa and South Asia; approximately 15-20% of untreated gonococcal urethritis cases develop stricture); non-gonococcal urethritis (Chlamydia trachomatis — a more indolent urethritis than gonorrhoea but can cause stricture with repeated infection or inadequate treatment). Traumatic causes: pelvic fracture urethral injury (PFUI) — the most severe form of urethral injury, occurring in high-energy pelvic trauma (RTC, falling from height) where the posterior urethra (membranous segment) is sheared at the level of the prostate-membranous junction; causes complete urethral disruption requiring emergency suprapubic catheterisation followed by delayed urethroplasty 3-6 months later; associated with erectile dysfunction in 30-80% of cases. Straddle injury — direct blunt trauma to the perineum (falling astride a bar or fence rail; cycling accidents on the top tube) compresses the bulbar urethra against the inferior pubic rami, causing a contusion or partial disruption that heals with stricture formation. Lichen sclerosus (LS) — previously called balanitis xerotica obliterans (BXO): a chronic inflammatory dermatosis primarily affecting the foreskin, glans, and external meatus (the fossa navicularis) in men, causing progressive penile urethral and meatal stricture; accounts for approximately 10-15% of anterior urethral strictures in developed countries; characterised by white, sclerotic, parchment-like skin of the affected area; the stricture caused by LS is progressive and tends to involve long segments of the penile urethra, making treatment challenging.

Urethral stricture predominantly causes obstructive (voiding) lower urinary tract symptoms (LUTS) by reducing urethral lumen calibre and increasing urethral resistance. The severity of symptoms broadly correlates with the degree of lumen reduction — mild narrowing may cause only a mildly reduced stream, while severe narrowing causes complete urinary retention. Voiding LUTS symptoms from urethral stricture: reduced urinary stream (the most common presenting complaint — characteristically worse than it has previously been; the patient notices the stream has become progressively weaker over months to years); urinary hesitancy (difficulty initiating the stream, particularly prominent in cold environments where alpha-adrenergic tone increases); straining to void (the patient bears down abdominally to increase detrusor pressure to overcome the urethral obstruction); intermittent or interrupted stream (the stream starts, weakens, and restarts repeatedly during a single void — from turbulence and dynamic collapse at the stricture site); prolonged voiding time (a simple and sensitive clinical test — the patient's voiding time extends to 30-90 seconds vs. normal 5-15 seconds); terminal dribbling (the stream fails to stop cleanly, dribbling for an extended period after the main void); and post-void dribble and sense of incomplete emptying from elevated post-void residual (PVR above 100-200 mL). Storage LUTS may also develop from secondary bladder dysfunction: urgency and urinary frequency (from detrusor overactivity developing in response to chronic outlet obstruction and repeated high-pressure voiding straining); nocturia; and urge incontinence. Urethral discharge: mucopurulent or clear urethral discharge preceding or accompanying the voiding symptoms suggests an infective (gonococcal or non-gonococcal urethritis) aetiology — a critical differentiating feature warranting urgent STI testing. Complications presenting as symptoms: recurrent urinary tract infections (dysuria, frequency, haematuria, fever — from ascending infection in the urinary stasis above the stricture); epididymo-orchitis (scrotal pain and swelling from ascending infection reaching the epididymis and testis — a specific complication of urethral stricture with distal obstruction); and acute urinary retention (complete inability to void despite an urgent desire — the most dramatic presentation, causing severe lower abdominal pain and palpable distended bladder requiring emergency catheterisation; urethral catheterisation may be impossible and suprapubic catheterisation required).

Uroflowmetry: the patient voids into a calibrated electronic flow meter — Qmax (peak urinary flow rate) below 10 mL/s strongly suggests significant urethral obstruction (though it does not differentiate stricture from BPH or detrusor underactivity); the flow curve pattern is diagnostically useful — stricture characteristically produces a prolonged, plateau-shaped, low-amplitude curve (in contrast to the obstructed BPH pattern which can be similar, or the abdominal straining pattern of detrusor underactivity); a voided volume of at least 150 mL is required for the result to be valid; uroflowmetry is the standard monitoring investigation after any stricture treatment (a fall in Qmax below 10 mL/s at follow-up signals recurrence). Post-void residual (PVR) bladder scan: performed immediately after uroflowmetry; PVR above 100 mL indicates incomplete bladder emptying from obstruction or detrusor underactivity; PVR above 300 mL indicates severe chronic retention with risk of overflow incontinence, hydronephrosis, and renal impairment — requiring catheterisation before definitive treatment. Retrograde urethrogram (RUG): the gold standard imaging investigation for urethral stricture — contrast medium injected retrogradely via the external urethral meatus under fluoroscopy outlines the urethral lumen; RUG precisely demonstrates the location (meatus, penile, bulbar, membranous, or posterior urethra), length (measured in cm), and severity of narrowing of the stricture; essential before planning any surgical treatment as it determines the appropriate surgical approach. Voiding cystourethrogram (VCUG): performed in conjunction with RUG when posterior urethral involvement is suspected — the patient voids with contrast filling the bladder via suprapubic puncture or catheter, outlining the urethra from the bladder neck distally; VCUG assesses the proximal extent of stricture and the urethrovesical junction. Ultrasound urethrogram (USUM): high-resolution perineal ultrasound of the anterior urethra — more accurate than RUG for assessing the radial depth of spongiofibrosis (scar tissue in the urethral spongiosum beyond the mucosa), which determines whether a DVIU is likely to succeed (minimal spongiofibrosis — more likely to respond; deep or extensive spongiofibrosis — urethroplasty required). Urethroscopy: direct endoscopic visualisation of the urethra under general or regional anaesthesia allows precise characterisation of the stricture and simultaneous treatment by incision (DVIU) or dilatation. Urine culture (midstream specimen): essential to identify active UTI requiring antibiotic treatment before planned instrumentation or surgery.

Urethral dilation: temporary symptomatic relief, high recurrence rate (>80%), not recommended as primary treatment. Optical internal urethrotomy (OIU/direct vision internal urethrotomy — DVIU): incision of stricture under vision; effective for short (<2 cm) bulbar strictures with no prior intervention. Urethroplasty: gold standard for longer, recurrent, or complex strictures; anastomotic (end-to-end excision) for short bulbar strictures; substitution (buccal mucosa graft) for longer strictures; 5-year success rate >85%. Suprapubic catheter for acute urinary retention. Regular monitoring of treatment response, early detection of side effects, and ongoing assessment of disease progression are essential components of optimising patient outcomes over the long term. Treatment plans should be proactively reviewed and appropriately adjusted based on clinical response, patient-reported tolerability, changing patient circumstances, and continuously evolving evidence-based clinical guidelines. Meaningful shared decision-making between patients and their healthcare team, incorporating patient values and treatment preferences, consistently improves both treatment adherence and long-term outcomes.

Recurrent urinary tract infections (ascending from urethral obstruction — epididymo-orchitis, prostatitis, pyelonephritis). Bladder dysfunction (detrusor overactivity, trabeculation, diverticula). Acute urinary retention requiring emergency catheterization. Hydroureteronephrosis and progressive renal impairment from chronic obstruction. Post-operative: urethrocutaneous fistula, wound infection, erectile dysfunction (with posterior urethral repair), recurrent stricture. Long-term specialist follow-up and structured regular review are essential to detect and appropriately manage complications at the earliest possible stage, minimising long-term disability, preserving organ function, and improving the overall prognosis. Patient education about the early warning signs of complications and clear guidance on when to seek urgent medical attention empowers timely help-seeking behaviour and reduces preventable serious adverse outcomes. Psychological impact — including depression, anxiety, and reduced quality of life — should be proactively assessed and addressed as part of comprehensive complication management.

Atraumatic urethral catheterisation technique is the most important preventive measure against iatrogenic stricture: use the smallest diameter catheter appropriate for the clinical indication (size 12-14 French for most adult males — not the larger 16-18 Fr routinely used in many hospitals); always use copious water-soluble lubricant (ideally lignocaine gel — both lubricating and anaesthetic) to minimise friction and urethral mucosal injury; never apply force if resistance is felt — forcing a catheter against resistance risks perforation or significant trauma causing stricture at the level of resistance; consider flexible cystoscopy under direct vision if catheter passage is difficult; male-specific curved tip catheters (Coude or Tieman-tip) are easier to pass in men with BPH or difficult urethras. Prompt and complete treatment of urethritis: gonorrhoea (Neisseria gonorrhoeae urethritis) should be treated with a single IM dose of ceftriaxone 500 mg (UK BASHH guidelines) — not oral antibiotics alone, which have higher failure rates; treatment should be confirmed by test of cure nucleic acid amplification test (NAAT) 2 weeks after treatment; inadequately treated or recurrent gonococcal urethritis is the primary preventable infectious cause of urethral stricture globally. Chlamydia trachomatis urethritis should be treated with doxycycline 100 mg twice daily for 7 days (preferred over azithromycin single dose for urethritis cure rates). Hypospadias reconstruction quality: paediatric urological centres with high-volume specialist expertise in hypospadias repair achieve substantially lower rates of long-term urethral stricture and fistula than lower-volume centres — referral of hypospadias to specialist paediatric urology units is the most important preventive measure for this category. Surveillance after urethral stricture treatment: uroflowmetry monitoring at 3, 6, and 12 months after any stricture treatment (DVIU or urethroplasty), then annually; a Qmax falling below 10 mL/s signals recurrence before symptoms become severe, allowing early retreatment before the bladder decompensates. Lichen sclerosus management: early diagnosis and treatment of genital lichen sclerosus with potent topical corticosteroids (clobetasol propionate 0.05% ointment) reduces LS progression and stricture development — circumcision removes the predominantly affected foreskin and reduces LS exposure, but meatal and penile urethral involvement requires ongoing urological surveillance.

Go to A&E immediately for: complete inability to pass urine (acute urinary retention — requires urgent urethral or suprapubic catheterisation); severe lower abdominal pain and a palpable distended bladder; or fever with rigors and urinary symptoms (urosepsis — requires IV antibiotics urgently). See your GP within 1–2 weeks if you notice: a progressively weak, reduced, or split urinary stream; difficulty starting to urinate or straining; a sensation of incomplete bladder emptying; or recurrent urinary tract infections — these are the classic symptoms of urethral stricture and warrant uroflowmetry and urology referral. Men who have a history of: gonorrhoea or chlamydia urethritis (especially poorly treated); urethral catheterisation or cystoscopy; pelvic fracture; or straddle injury to the perineum should proactively report any new voiding symptoms to their GP, as stricture formation may be delayed months to years after the initial injury. Refer to a reconstructive urologist (not just a general urologist) for any stricture longer than 2 cm, recurrent stricture after urethrotomy, or stricture involving the penile or posterior urethra — urethroplasty by a high-volume specialist achieves over 85% long-term cure rates.