Urinary Incontinence


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Definition

Urinary (or bladder) incontinence is when you are not able to keep urine from leaking out of your urethra, the tube that carries urine out of your body from your bladder. You may leak urine from time to time. Or, you may not be able to hold any urine.

The three main types of urinary incontinence are:

  • Stress incontinence -- occurs during certain activities like coughing, sneezing, laughing, or exercise.
  • Urge incontinence -- involves a strong, sudden need to urinate. Then the bladder squeezes and you lose urine. You don't have enough time after you feel the need to urinate to get to the bathroom before you do urinate.
  • Overflow incontinence -- occurs when the bladder cannot empty. This leads to dribbling.
  • Mixed incontinence -- involves more than one type of urinary incontinence.

Bowel incontinence is when you are unable to control the passage of stool. It is not covered in this article.


Alternative Names

Loss of bladder control; Uncontrollable urination; Urination - uncontrollable; Incontinence - urinary


Considerations

NORMAL URINATION

Normally, the bladder begins to fill with urine from the kidneys. The bladder stretches to allow more and more urine.

You should feel the first urge to urinate when there is around 200 mL (just under 1 cup) of urine stored in your bladder. A healthy nervous system will respond to this stretching sensation by letting you know that you have to urinate. At the same time, the bladder should keep filling.

The average person can hold around 350 to 550 mL (more than 2 cups) of urine in the bladder. Two muscles help control the flow of urine:

  • The sphincter (the circular muscles around the opening of the bladder) must be able to squeeze to prevent urine from leaking.
  • The bladder wall muscle (detrusor) must stay relaxed so the bladder can expand.

When it is time to empty the bladder, the bladder wall (detrusor) muscle contracts or squeezes to force urine out of the bladder. Before this muscle squeezes, your body must be able to relax the sphincter to allow the urine to pass out of your body.

To control urination, you must have:

  • A working urinary system
  • A working nervous system
  • The ability to feel and respond to the urge to urinate

Incontinence is most common among the elderly. Women are more likely than men to have urinary incontinence.

Infants and children are not incontinent before they have been toilet trained. Children up to age 6 may still have accidents sometimes. Young (and sometimes teenage) girls may leak a little bit of urine when they laugh.

It is normal for children to wet the bed until age 5 or 6.


Common Causes

Causes of urinary incontinence include:

  • Blockage in the urinary system
  • Brain or nerve problems
  • Dementia or other mental health problems that make it hard to feel and respond to the urge to urinate
  • Problems with the urinary system
  • Nerve and muscle problems

Incontinence may be sudden and go away after a short period of time. Or, it may continue long-term. Causes of sudden or temporary incontinence include:

  • Bedrest -- for example, when recovering from surgery
  • Certain medications (such as diuretics, antidepressants, tranquilizers, some cough and cold remedies, and antihistamines for allergies)
  • Mental confusion
  • Pregnancy
  • Prostate infection or inflammation
  • Stool impaction from severe constipation, which causes pressure on the bladder
  • Urinary tract infection or inflammation
  • Weight gain

Causes that may be more long-term:

  • Bladder cancer
  • Bladder spasms
  • Depression
  • Large prostate in men
  • Nervous system conditions, such as multiple sclerosis or stroke
  • Nerve or muscle damage after radiation treatment to the pelvis
  • Pelvic prolapse in women -- falling or sliding of the bladder, urethra, or rectum into the vagina, which may be caused by pregnancy and delivery
  • Problems with the urinary tract
  • Spinal cord injuries
  • Weakness of the sphincter, the circle-shaped muscles that open and close the bladder (this can be caused by prostate surgery in men, or surgery to the vagina in women)

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: 9/19/2011
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; and Louis S. Liou, MD, PhD, Assistant Professor of Urology, Department of Surgery, Boston University School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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Last Updated 12/6/2011
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