Neurogenic bladder !

Bladder control problems caused by damage to the brain, spinal cord or nerves. The bladder may empty too often, too little, or not at all.

Updated 2026-11-01

Structures involved

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In embryology

In the clinical exam

Bladder examination: the distended bladder

Why it happens

What it is

Bladder and sphincter dysfunction caused by disease of the nervous system controlling urination. Depending on the level of the lesion, the bladder may be overactive (spastic) or underactive (flaccid), and the bladder and sphincter may fail to coordinate.

Who gets it

Very common after spinal cord injury and in spina bifida, multiple sclerosis, stroke and Parkinson disease. In Colombia, traffic and violence-related spinal cord injuries and myelomeningocele in children make it a frequent problem in rehabilitation and paediatric urology.

Causes

Spinal cord injury
Spina bifida (myelomeningocele) and tethered cord
Multiple sclerosis and transverse myelitis
Stroke, Parkinson disease and dementia (lesions above the pons)
Diabetic autonomic neuropathy
Cauda equina syndrome, lumbar disc disease and pelvic surgery damaging the pelvic nerves

Risk factors

Spinal cord injury or congenital spinal defects
Long-standing diabetes
Progressive neurological disease
Radical pelvic surgery

Pathophysiology

Voiding is coordinated by the pontine micturition centre, with sacral (S2–S4) parasympathetic fibres contracting the detrusor and pudendal fibres controlling the external sphincter. Lesions above the pons give an overactive detrusor with coordinated voiding. Spinal lesions between the pons and the sacral cord give an overactive detrusor with detrusor–sphincter dyssynergia and high bladder pressures. Lesions of the conus, cauda equina or peripheral nerves give an underactive, large bladder with retention and overflow.

Classification

Suprapontine lesion: urge incontinence, coordinated sphincter, low residual
Suprasacral spinal lesion: spastic bladder with detrusor–sphincter dyssynergia
Sacral or infrasacral lesion (conus, cauda equina, peripheral nerve): flaccid bladder with retention and overflow

Symptoms and signs

Urgency, frequency and urge incontinence (overactive type)
Difficulty starting, weak stream, incomplete emptying (underactive type)
Overflow leakage with a full bladder and no sensation of fullness
Recurrent urinary infections
Associated bowel dysfunction and sexual dysfunction

Diagnosis

Clinical: Neurological history and examination (sensation, reflexes, saddle area, anal tone), bladder diary and voiding pattern. Urodynamic studies define the type and identify high-pressure bladders.
Tests: Post-void residual volume, urinalysis and culture when infection is suspected, creatinine. Urodynamics with pressure–flow studies (and electromyography of the sphincter) is the key test.
Imaging: Kidney and bladder ultrasound for hydronephrosis, residual and stones; voiding cystourethrography for reflux; spinal MRI to look for the neurological cause.

Differential diagnosis

Benign prostatic hyperplasia or urethral stricture
Idiopathic overactive bladder
Stress urinary incontinence
Drug-induced retention (anticholinergics, opioids)
Pelvic organ prolapse

Goal of treatment

Protect the upper urinary tract (keep bladder pressures low), achieve regular complete emptying and continence, and prevent infection.

Treatment

Procedure: Clean intermittent catheterisation on a schedule is the standard for incomplete emptying; teaching the patient or carer is a key nursing task. Indwelling catheters are avoided where possible.
Medical: Antimuscarinic drugs or beta-3 agonists to lower detrusor pressure in overactive bladders; alpha-blockers may help outlet resistance in selected cases.
Rehabilitation: Bladder and bowel programmes, timed voiding, pelvic floor work and adequate fluid intake.
Surgical: For refractory cases: botulinum toxin into the detrusor, bladder augmentation, urinary diversion or sacral neuromodulation.
Follow-up: Lifelong follow-up with kidney ultrasound, creatinine and periodic urodynamics; monitoring for infection, stones and autonomic dysreflexia.

Drugs for this condition

Complications

Recurrent urinary infection and pyelonephritis
Vesicoureteral reflux, hydronephrosis and chronic kidney disease
Bladder stones
Autonomic dysreflexia in high spinal cord injury
Skin breakdown from leakage

Prognosis

A long-term condition. With intermittent catheterisation and regular follow-up most people keep good kidney function; kidney failure from high bladder pressures, once a common cause of death after spinal injury, is now largely preventable.

Prevention

Folic acid before and in early pregnancy to reduce neural tube defects
Early urological assessment after spinal cord injury and in spina bifida

Test yourself

Think of the answer, then tap the question to see it.

What is detrusor–sphincter dyssynergia and which lesion causes it?

The detrusor contracts while the external sphincter fails to relax, typically with spinal cord lesions between the pons and the sacral cord.

What type of bladder results from a conus or cauda equina lesion?

A flaccid, underactive bladder with retention and overflow incontinence.

What is the standard method to empty the bladder in neurogenic retention?

Clean intermittent catheterisation on a regular schedule.

What is the most common trigger of autonomic dysreflexia?

A distended bladder (blocked catheter, retention), followed by constipation.

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Educational information, not medical advice. For any symptom, see a health professional.

Sources: Neurogenic bladder: MedlinePlus Medical Encyclopedia (MedlinePlus (U.S. National Library of Medicine), 2024).

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Representative model, for educational purposes only.

Urinary bladder highlighted on the Durgical 3D model