What is Overactive bladder (Urge Incontinence)?
Urgency is caused when the bladder muscle, the detrusor, begins to contract and signals a need to urinate, even when the bladder is not full. Another name for this phenomenon is detrusor overactivity.
Overactive bladder can result from physical problems that keep your body from halting involuntary bladder muscle contractions. Such problems include damage to the brain, the spine, or the nerves extending from the spine to the bladder — for example, from an accident, diabetes, or neurological disease. Irritating substances within the bladder, such as those produced during an infection, might also cause the bladder muscle to contract.
Often there is no identifiable cause for overactive bladder, but people are more likely to develop the problem as they age. Postmenopausal women, in particular, tend to develop this condition, perhaps because of age-related changes in the bladder lining and muscle. African American women with incontinence are more likely to report symptoms of overactive bladder than stress incontinence, while the reverse is true in white women.
A condition called myofascial pelvic pain syndrome has been identified with symptoms that include overactive bladder accompanied by pain in the pelvic area or a sense of aching, heaviness, or burning.
In addition, infections of the urinary tract, bladder, or prostate can cause temporary urgency. Partial blockage of the urinary tract by a bladder stone, a tumor (rarely), or, in men, an enlarged prostate (a condition known as benign prostatic hyperplasia, or BPH) can cause urgency, frequency, and sometimes urge incontinence. Surgery for prostate cancer or BPH can trigger symptoms of overactive bladder, as can freezing (cryotherapy) and radiation seed treatment (brachytherapy) for prostate cancer.
Neurological diseases (such as Parkinson’s disease and multiple sclerosis) can also result in urge incontinence, as can a stroke. When hospitalized following a stroke, 40% to 60% of patients have incontinence; by the time they are discharged, 25% still have it, and one year later, 15% do.
Do you get an overwhelming urge to urinate just when you arrive home and start to open the door? Also called “latchkey incontinence,” this phenomenon is a good demonstration of the bladder-brain connection. When you feel the urge to urinate as you’re going home, you suppress it until you arrive. Eventually, the bladder becomes conditioned to associate arriving home with urinating, and the urge comes on whether or not your bladder is full. This is not a “psychological” problem, but a reflex-conditioning problem, much as when you salivate upon smelling something good to eat.