Renal/Urology · PANCE / PANRE

Urinary Incontinence (Stress, Urge, Overflow)

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Involuntary loss of urine; classified by mechanism into stress, urge, mixed, and overflow.

Also known as: urinary incontinence, stress incontinence, urge incontinence, overactive bladder, overflow incontinence

Overview

Involuntary leakage of urine. Categorized by mechanism: stress (with increased intra-abdominal pressure), urge (sudden compelling need with leakage — overactive bladder), mixed (features of both), overflow (incomplete emptying with continuous dribbling), and functional (intact urinary system but barriers to toileting).

Epidemiology

Affects ~20-50% of community-dwelling women and increases with age; ~17% of women aged 18-44, >30% over age 60. Stress incontinence predominates in younger women; urge incontinence and mixed types predominate in older women and men with BPH-related urinary symptoms.

Try two board-style Urinary Incontinence questions

Real questions from the FirstPassPA bank, with the full explanation. Pick an answer — no signup, no email.

Question 1RenalEasy
A 70-year-old man with benign prostatic hyperplasia reports several months of urinary urgency, frequency, and occasional urge incontinence consistent with overactive bladder. He takes no other medications and has no history of glaucoma or cognitive complaints. His clinician plans to start oxybutynin and reviews the adverse effects that warrant counseling before prescribing. Which of the following adverse effects is of greatest concern given his benign prostatic hyperplasia?
  • AAngle-closure glaucoma
  • BCognitive impairment
  • COrthostatic hypotension
  • DAcute urinary retention
Reveal answer & full explanation
Correct answer: D — Acute urinary retention
  • AAngle-closure glaucoma
  • BCognitive impairment
  • COrthostatic hypotension
  • DAcute urinary retention✓

Why Acute urinary retention is correct

  • Oxybutynin is an antimuscarinic (anticholinergic) agent that reduces detrusor smooth-muscle contractility to treat overactive bladder
  • In a man with benign prostatic hyperplasia, the bladder already empties against a partially obstructed outlet; blunting detrusor contraction can tip him into incomplete emptying and acute urinary retention
  • This bladder-outlet-obstruction interaction is what makes retention the adverse effect of greatest concern specifically because of his BPH
  • The Beers Criteria flag anticholinergic agents as potentially inappropriate in older adults, and a beta-3 agonist (mirabegron) is often preferred when BPH coexists because it lacks antimuscarinic outlet effects

Why the others are wrong

  • Angle-closure glaucoma — antimuscarinics can precipitate it, but only in patients with anatomically narrow angles, and this man has no glaucoma history; it is not amplified by BPH (confused-with trap: a real anticholinergic risk that is not the BPH-specific one)
  • Cognitive impairment — anticholinergics can worsen cognition in older adults, but this risk relates to CNS exposure rather than prostatic obstruction; choosing it is premature closure on 'elderly plus anticholinergic'
  • Orthostatic hypotension — this is a class effect of the alpha-1 blockers (e.g., tamsulosin) used to treat BPH, not of oxybutynin; it is a buzzword trap from confusing the two BPH-related drug classes
Question 2RenalMedium
A 68-year-old man with a 12-year history of type 2 diabetes mellitus reports continuous dribbling of urine and a sensation of incomplete bladder emptying for several months. He describes a weak urinary stream and frequent nighttime voiding. On examination, the lower abdomen is distended and dull to percussion above the pubic symphysis, and digital rectal examination reveals a smoothly enlarged prostate. Urinalysis is unremarkable. Which of the following is the most appropriate next diagnostic test?
  • AMultichannel urodynamic studies
  • BCystoscopic bladder evaluation
  • CPelvic floor MRI imaging study
  • DPost-void residual measurement
Reveal answer & full explanation
Correct answer: D — Post-void residual measurement
  • AMultichannel urodynamic studies
  • BCystoscopic bladder evaluation
  • CPelvic floor MRI imaging study
  • DPost-void residual measurement✓

Why Post-void residual measurement is correct

  • This man has continuous dribbling, a weak stream, a sense of incomplete emptying, and a distended bladder, pointing to overflow incontinence from chronic urinary retention, here driven by BPH-related outlet obstruction and likely diabetic neurogenic bladder.
  • Post-void residual (PVR), obtained by bladder scan or catheterization, is the key step that distinguishes overflow from other incontinence types; a PVR over 150-200 mL confirms retention and incomplete emptying.
  • After urinalysis, PVR is the appropriate, low-cost, noninvasive next test in any incontinence workup where retention is suspected, especially in older adults, diabetics, and men with BPH.

Why the others are wrong

  • Multichannel urodynamic studies: a more invasive functional study reserved for an unclear diagnosis, treatment failure, or pre-surgical evaluation, not the first-line test here.
  • Cystoscopic bladder evaluation: indicated to evaluate hematuria or suspected bladder cancer, but this patient has a bland urinalysis and no painless hematuria, so it does not address the suspected retention.
  • Pelvic floor MRI imaging study: used when a pelvic floor disorder, prolapse, or anatomic abnormality is suspected, and it does not quantify residual urine, so it is not the appropriate next step.
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Risk factors

  • Female sex (stress incontinence; multifactorial)
  • Age (collagen loss, detrusor changes, comorbidities)
  • Parity, vaginal childbirth, obstetric injury
  • Obesity (intra-abdominal pressure)
  • Pelvic surgery, radiation
  • Menopause (estrogen deficiency, urogenital atrophy)
  • Neurologic disease: stroke, multiple sclerosis, spinal cord injury, Parkinson, dementia
  • Medications: diuretics (urge), alpha-blockers (stress in women), sedatives (functional), opioids (overflow)
  • Diabetes (neurogenic bladder), prostatic enlargement (overflow), cognitive impairment

Pathophysiology

Stress: urethral hypermobility or intrinsic sphincter deficiency allows leakage when intra-abdominal pressure (cough, sneeze, exertion) exceeds urethral closure pressure. Urge: detrusor overactivity — involuntary detrusor contractions, often idiopathic or related to neurologic disease. Overflow: chronic urinary retention from outlet obstruction (BPH, stricture) or detrusor underactivity (diabetes, neurogenic) causes high post-void residual and continuous overflow leakage. Functional: cognitive or mobility impairment prevents timely toileting.

Clinical presentation

Symptoms

  • Stress: leakage with cough, sneeze, laugh, exertion, position change
  • Urge: sudden compelling need to void with inability to defer; large-volume leakage
  • Mixed: features of both stress and urge
  • Overflow: continuous or post-void dribbling; weak stream; sensation of incomplete emptying; nocturia
  • Functional: leakage due to inability to reach toilet (mobility, cognition)

Signs / physical exam

  • Pelvic exam (women): atrophic vaginitis, prolapse (cystocele, rectocele, uterine prolapse), urethral hypermobility (Q-tip test), pelvic floor strength
  • Cough stress test — direct leakage with cough at full bladder is diagnostic for stress incontinence
  • Abdominal exam: distended bladder suggests retention/overflow
  • DRE in men: enlarged prostate, masses
  • Neurologic exam: focal deficits, anal sphincter tone (S2-S4)
  • Post-void residual (PVR) — bladder scan or catheter; >150-200 mL suggests retention

Classic findings

Postmenopausal woman with leakage when coughing or laughing = stress incontinence. Sudden urge with leakage en route to bathroom = urge incontinence.

Differential diagnosis

  • UTI — Acute onset, dysuria, frequency; positive UA/culture; reversible cause of incontinence
  • Bladder cancer — Painless hematuria, smoking history; cystoscopy
  • Vaginal/urethral fistula — Continuous urine leakage from vagina; history of pelvic surgery/childbirth; dye test or imaging
  • Pelvic organ prolapse — Vaginal bulge sensation, mass on Valsalva, may worsen or 'mask' incontinence
  • Neurogenic bladder — Spinal cord lesion, MS, diabetes; urodynamic abnormality
  • BPH (men) — Obstructive and irritative symptoms; enlarged prostate; elevated PVR
  • Detrusor sphincter dyssynergia — Spinal cord injury between brainstem and sacral cord; urodynamic study diagnostic

Diagnostic workup

Diagnostic criteria

Clinical diagnosis based on history, exam, and basic testing (UA, PVR). Urodynamic studies reserved for refractory cases, mixed picture, neurogenic suspicion, or pre-surgical evaluation. Voiding diary (3-day) quantifies severity and pattern.

Labs

  • Urinalysis with microscopy — exclude infection, hematuria (bladder cancer)
  • BMP — assess renal function, glucose (poorly controlled diabetes contributes)
  • Urine culture if pyuria

Imaging

  • Post-void residual (PVR) via bladder scan or catheterization — >150-200 mL suggests overflow
  • Pelvic ultrasound or MRI if pelvic floor disorder, prolapse, or anatomic abnormality suspected
  • Urodynamic studies — for unclear diagnosis, treatment failure, before invasive treatment

Diagnostic algorithm

TypeTriggerMechanismFirst-line Treatment
StressCough, sneeze, exertionUrethral hypermobility / sphincter deficiencyKegels, weight loss, pessary, midurethral sling
UrgeSudden compelling needDetrusor overactivityBladder training, antimuscarinic, mirabegron
MixedBothBothAddress most bothersome first
OverflowContinuous dribblingRetention (obstruction or underactive detrusor)Treat cause (BPH, neurogenic); CIC if needed
FunctionalMobility/cognitiveIntact urinary systemScheduled toileting, OT, environmental aids
Urinary incontinence classification by mechanism, trigger, and first-line treatment.

Treatment

First-line

  • Lifestyle: weight loss (especially for stress incontinence), fluid management, caffeine and alcohol reduction, smoking cessation
  • Bladder training (timed voiding, urge suppression techniques) — for urge incontinence
  • Pelvic floor muscle training (Kegel exercises) ± biofeedback — first-line for stress incontinence (60-70% improvement)
  • Stress incontinence:
  • Pessary or urethral plug — non-surgical mechanical support
  • Midurethral sling (TVT, TVT-O) — most effective definitive treatment
  • Bulking agents (collagen, calcium hydroxylapatite) — less invasive option
  • Urge incontinence / overactive bladder:
  • Behavioral therapy first
  • Antimuscarinic — oxybutynin, tolterodine, solifenacin, darifenacin, trospium, fesoterodine (caution in elderly — cognitive side effects)
  • Beta-3 agonist — mirabegron, vibegron (preferred in elderly; no cognitive risk; check BP)
  • Vaginal estrogen for postmenopausal women with urogenital atrophy

Second-line / adjunct

  • Refractory urge incontinence:
  • Onabotulinumtoxin A intravesical injection — for refractory OAB
  • Sacral neuromodulation (InterStim)
  • Percutaneous tibial nerve stimulation (PTNS)
  • Overflow incontinence:
  • Treat obstruction (alpha-blocker — tamsulosin, alfuzosin, silodosin — for BPH; 5-alpha-reductase inhibitor — finasteride, dutasteride; surgery if refractory)
  • Clean intermittent catheterization for underactive detrusor
  • Functional incontinence: occupational therapy, scheduled toileting, environmental modifications, caregiver education
  • Avoid culprit medications when possible (diuretics, alpha-blockers in women, anticholinergics in elderly)

Complications

  • Quality of life impact: social isolation, depression, sexual dysfunction
  • Skin breakdown, dermatitis, pressure ulcers
  • Recurrent UTI (especially overflow)
  • Falls (rushing to bathroom, nocturia)
  • Caregiver burden, institutionalization
  • Hydronephrosis and renal impairment from chronic retention
  • Treatment-related: antimuscarinic side effects (dry mouth, constipation, cognitive impairment), surgical complications

PANCE pearls

  • PVR is essential to distinguish overflow from other types — a key step in workup of any incontinence presentation, especially in older adults.
  • First-line for stress incontinence: pelvic floor muscle training (Kegels). Midurethral sling is the most effective definitive treatment.
  • Antimuscarinics (oxybutynin in particular) are on the AGS Beers criteria — high risk of cognitive impairment, dementia, and falls in elderly. Prefer mirabegron or vibegron in older adults.
  • Mixed incontinence: treat the most bothersome component first.
  • Reversible causes (DIAPPERS): Delirium, Infection, Atrophic vaginitis, Pharmaceuticals, Psychiatric, Excess urine output, Restricted mobility, Stool impaction.
  • Overflow incontinence in a man = consider BPH; in a diabetic = consider neurogenic bladder; bladder scan PVR confirms.

References

  • AUA/SUFU 2019 — Surgical Treatment of Female Stress Urinary Incontinence: AUA/SUFU Guideline (Kobashi et al., J Urol 2017, amended 2019)
  • AUA/SUFU 2024 — Diagnosis and Treatment of Overactive Bladder (Non-Neurogenic) in Adults: AUA/SUFU Guideline Amendment 2024
  • ACOG 2019 — ACOG Practice Bulletin No. 155: Urinary Incontinence in Women

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Acute Kidney Injury (AKI)Chronic Kidney Disease (CKD)End-Stage Renal Disease and DialysisNephrotic SyndromeNephritic SyndromeIgA NephropathyAcute Tubular Necrosis (ATN)Acute Interstitial Nephritis (AIN)Post-Streptococcal Glomerulonephritis (PSGN)Autosomal Dominant Polycystic Kidney Disease (ADPKD)Urolithiasis (Kidney Stones)Acute Cystitis (Uncomplicated UTI)Acute PyelonephritisRenal Cell Carcinoma (RCC)

Differentials & related conditions

Bladder CancerPelvic Organ ProlapseBenign Prostatic Hyperplasia (BPH)

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