Urge Incontinence


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Definition

Urge incontinence is the strong, sudden need to urinate due to bladder spasms or contractions.


Alternative Names

Overactive bladder; Detrusor instability; Detrusor hyperreflexia; Irritable bladder; Spasmodic bladder; Unstable bladder; Incontinence - urge; Bladder spasms


Causes, incidence, and risk factors

To hold urine, the lower urinary tract and nervous system must work properly. You must also be able to feel and respond to the urge to urinate.

For the bladder to fill and store urine, the sphincter muscle (which controls the flow of urine out of the body) and bladder wall muscle (detrusor) must be working.

The process of urination involves two parts:

  • Filling and storage
  • Emptying

During the filling and storage phase, the bladder stretches so it can hold more urine. An average person's bladder can hold 350 milliliters (ml) to 550 ml of urine. Most people will feel like they need to urinate when there is about 200 ml of urine in the bladder.

The nervous system tells you that you need to urinate. It also allows your bladder to keep filling.

During the emptying phase, the detrusor muscle must contract, forcing urine out of the bladder. The sphincter muscle must relax at the same time, so that urine can flow out of the body.

An infant's bladder automatically contracts when a certain amount of urine has collected in the bladder. As the child grows older and learns to control urination, part of the brain (cerebral cortex) helps prevent bladder muscle contractions. This allows urination to be delayed until the person is ready to use the bathroom.

The bladder may contract too often from nervous system (neurological) problems or bladder irritation.

URGE INCONTINENCE

With urge incontinence, you leak urine because the bladder muscles contract at the wrong times. Often these contractions occur no matter how much urine is in the bladder.

Urge incontinence may result from:

  • Bladder cancer
  • Bladder inflammation
  • Bladder outlet obstruction
  • Bladder stones
  • Infection
  • Nervous system diseases (such as multiple sclerosis)
  • Nervous system injuries (such as spinal cord injury or stroke)

In men, urge incontinence also may be due to:

  • Bladder changes caused by benign prostatic hypertrophy (BPH)
  • Bladder outlet obstruction from an enlarged prostate

In most cases of urge incontinence, no cause can be found.

Although urge incontinence may occur in anyone at any age, it is more common in women and the elderly.


References

Gerber GS, Brendler CB. Evaluation of the urologic patient: History, physical examination, and urinalysis. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 3.

Resnick NM. Incontinence. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 25.

Deng DY. Urinary incontinence in women. Med Clin North Am. 2011;95:101-109.


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Review Date: 9/16/2011
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; and Scott Miller, MD, Urologist in private practice in Atlanta, Georgia. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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