Bladder Dysfunction

How the bladder works

The bladder is a muscular bag that stores urine at low pressure and empties when you choose. Storage depends on a relaxed bladder muscle (the detrusor) and a closed outlet (sphincter and pelvic floor). Emptying needs the detrusor to contract while the outlet relaxes. Nerves from the brain, spinal cord and pelvis coordinate both phases. Dysfunction happens when any part of this system fails.

Types of bladder dysfunction

Storage problems

• Stress incontinence: leaking with coughing, sneezing, laughing, lifting or exercise, because the pelvic floor and urethral sphincter are weak. Common after childbirth and menopause, and in men after prostate surgery.
• Overactive bladder: sudden, hard-to-delay urges (urgency), passing urine often (more than 8 times a day), getting up at night, with or without urge incontinence.
• Mixed incontinence: both stress and urge leaking.
• Bladder pain syndrome (interstitial cystitis): bladder pain and frequency without infection.

Emptying problems

• Bladder outlet obstruction: in men, usually an enlarged prostate; in women, prolapse or urethral narrowing. Weak stream, hesitancy, straining and dribbling.
• Underactive or atonic bladder: the bladder muscle is too weak to empty, causing retention and overflow leaking.
• Urinary retention: acute (sudden, painful, unable to urinate) or chronic (silent buildup).

Neurogenic bladder

Neurogenic bladder is dysfunction caused by nerve damage. Depending on where the damage is, the bladder may be overactive, underactive, or contract while the sphincter tightens (detrusor-sphincter dyssynergia), which raises pressure and can harm the kidneys.

Causes and risk factors

• Pregnancy and vaginal childbirth
• Menopause, with lower estrogen weakening tissues
• Pelvic organ prolapse
• Enlarged prostate and prostate surgery
• Neurological conditions: multiple sclerosis, stroke, Parkinson's disease, spinal cord injury, spina bifida, dementia, cauda equina syndrome
• Diabetes, which can cause both nerve damage and frequent urination
• Obesity and chronic cough, which strain the pelvic floor
• Constipation
• Medicines: diuretics, sedatives, anticholinergics, opioids and some antidepressants
• Caffeine and alcohol, which irritate the bladder and increase urine output
• Urinary tract infections, bladder stones and, rarely, bladder cancer

Symptoms

• Leaking urine
• Urgency and frequency
• Waking at night to urinate (nocturia)
• Weak or interrupted stream, hesitancy and straining
• Feeling of incomplete emptying and dribbling after finishing
• Bladder or pelvic pain
• Repeated infections

Diagnosis

1. History and bladder diary: recording drinks, toilet trips, volumes and leaks for 3 days.
2. Urine test for infection, blood and sugar.
3. Physical exam: abdomen, pelvic floor and prolapse in women, prostate in men, and nerve function.
4. Post-void residual scan: ultrasound after urinating to measure what is left.
5. Blood tests: kidney function and, in men, PSA when appropriate.
6. Urodynamic studies for complex cases, before surgery, or with neurological conditions.
7. Cystoscopy (a camera into the bladder) for blood in the urine or suspected bladder problems.

Treatment

Lifestyle and behavioral

• Pelvic floor muscle training for at least 3 months, ideally guided by a pelvic health physical therapist; first-line for stress and mixed incontinence.
• Bladder training: gradually increasing time between toilet trips to retrain urgency.
• Fluid management: 6 to 8 cups a day, less in the evening, and cutting caffeine, alcohol and fizzy drinks.
• Weight loss and treating constipation and chronic cough.
• Double voiding for incomplete emptying.

Medicines

• Overactive bladder: beta-3 agonists (mirabegron, vibegron) and antimuscarinics. Antimuscarinics can cause dry mouth and constipation and may affect memory in older adults.
• Enlarged prostate: alpha-blockers to relax the outlet and 5-alpha reductase inhibitors to shrink the prostate.
• Vaginal estrogen for postmenopausal urgency and recurrent infections.
• Desmopressin for selected people with nighttime urine overproduction.

Procedures

• Botulinum toxin injections into the bladder wall for overactive bladder not helped by medicines.
• Nerve stimulation: sacral neuromodulation or percutaneous tibial nerve stimulation.
• Mid-urethral slings, colposuspension or bulking agents for stress incontinence.
• Artificial urinary sphincter for men after prostate surgery.
• Prostate procedures such as TURP or laser surgery.
• Clean intermittent self-catheterization for retention and neurogenic bladder.
• Pessaries or surgery for pelvic organ prolapse.

Complications

Untreated bladder dysfunction can lead to urinary tract infections, skin irritation, falls from rushing to the toilet at night, sleep disruption, bladder stones, kidney damage in high-pressure or retention problems, and social isolation and depression.

Frequently asked questions

What are the types of bladder dysfunction?

The main types are stress incontinence (leaking with effort), overactive bladder (urgency and frequency), bladder outlet obstruction (weak stream from a blockage), underactive bladder (poor emptying), and neurogenic bladder, which is any bladder dysfunction caused by nerve damage.

What causes bladder dysfunction?

Common causes include pregnancy and childbirth, menopause, an enlarged prostate, pelvic organ prolapse, diabetes, nerve conditions such as multiple sclerosis or spinal cord injury, obesity, constipation, certain medicines, and caffeine or alcohol.

Can bladder dysfunction be cured?

Many types can be cured or greatly improved. Pelvic floor training cures or improves stress incontinence in many women, and surgery helps most others. Overactive bladder is usually controlled rather than cured. Neurogenic bladder is managed long term to protect the kidneys.

Is bladder dysfunction a normal part of aging?

It becomes more common with age, but it is not something you have to accept. Effective treatments exist at every age. New bladder symptoms should be checked, because infection, diabetes, prostate problems or neurological conditions may be responsible.