Stress incontinence is losing urine without meaning to during physical activity, such as coughing, sneezing, laughing, or exercise.
Incontinence - stress
Causes, incidence, and risk factors
To hold urine and control urination, the lower urinary tract and nervous system need to be working normally. You must also be able to recognize and respond to the urge to urinate.
The average adult bladder can hold over 2 cups (350 ml - 550 ml) of urine. Two muscles are involved in controlling urine flow:
The sphincter, which is a circle-shaped muscle around the urethra. You must be able to squeeze this muscle to prevent urine from leaking out.
The detrusor, which is the muscle of the bladder wall. This must stay relaxed so that the bladder can expand.
In stress incontinence, the sphincter pelvic muscles, which support the bladder and urethra, are weakened. The sphincter is not able to prevent urine from flowing when pressure is placed on the abdomen (such as when you cough, laugh, or lift something heavy).
Stress incontinence may occur from weakened pelvic muscles that support the bladder and urethra or because the urethral sphincter is not working correctly. Weakness may be caused by:
Stress incontinence is often seen in women who have had more than one pregnancy and vaginal delivery. It is also common in women whose bladder, urethra, or rectum wall stick out into the vagina (pelvic prolapse).
Risk factors for stress incontinence include:
Coughing over a long period of time (such as chronic bronchitis and asthma)
The main symptom of stress incontinence is losing urine without your control. It may occur when you:
Have sexual intercourse
Take part in physical activity
Signs and tests
The health care provider will perform a physical exam, including a:
Genital exam in men
Pelvic exam in women
In some women, a pelvic examination may show that the bladder or urethra is bulging into the vagina.
Tests may include:
Electromyogram (EMG) is (rarely) done to study muscle activity in the urethra or pelvic floor
Pad test (you are asked to exercise while wearing a sanitary pad-- after you exercise, the pad is weighed to find out how much urine you have lost)
Post-void residual (PVR) to measure the amount of urine left after urination
Tests to measure pressure and urine flow (urodynamic studies)
Test to view the inside of the bladder (cystoscopy)
Urinalysis or urine culture to rule out urinary tract infection
Urinary stress test (you are asked to stand with a full bladder, and then cough)
X-rays with contrast dye of the kidneys and bladder
Treatment depends on how severe your symptoms are and how much they affect your everyday life.
Your health care provider may ask you to stop smoking (if you smoke) and avoid caffeinated beverages (such as soda) and alcohol. You may be asked to keep a urinary diary, recording how many times you urinate during the day and night, and how often you leak urine.
There are four types of treatment for stress incontinence:
Pelvic floor muscle training
Examples of behavior changes include:
Drinking less fluid (if you drink more than normal amounts of fluid)
Urinating more often to reduce the amount of urine that leaks
Avoiding jumping or running, which can cause more urine to leak
Making your bowel movements more regular by taking dietary fiber or laxatives to avoid constipation (which can make incontinence worse)
Quitting smoking to reduce coughing and bladder irritation (and your risk of bladder cancer)
Avoiding alcohol and caffeine, which can stimulate the bladder
Losing weight if you are overweight
Avoiding food and drinks that irritate the bladder, such as spicy foods, carbonated drinks, and citrus fruits
Keeping blood sugar under control if you have diabetes
PELVIC FLOOR MUSCLE TRAINING
Pelvic muscle training exercises (called Kegel exercises) may help control urine leakage. These exercises keep the urethral sphincter strong and working properly.
Some women may use a device called a vaginal cone with pelvic exercises. You place the cone into the vagina. Then you try to squeeze the pelvic floor muscles to hold the cone in place. You can wear the cone for up to 15 minutes at a time, twice a day. Within 4 to 6 weeks, most women have some improvement in their symptoms.
Biofeedback and electrical stimulation may be helpful for people who have trouble doing pelvic muscle training exercises. These two methods can help you find the correct muscle group to work. Biofeedback can also help you learn how to control certain body responses.
Electrical stimulation therapy uses a low-voltage electrical current to stimulate and contract the correct group of muscles. The current is delivered using an anal or vaginal probe. The electrical stimulation therapy may be done at the health care provider's office or at home.
Treatment sessions usually last 20 minutes and may be done every 1 to 4 days. Newer techniques are being studied. One new technique uses an electromagnetic chair to make the pelvic floor muscles contract when the person is sitting.
Medicines tend to work better in patients with mild to moderate stress incontinence. There are several types of medications that may be used alone or in combination. They include:
Antimuscarinic drugs block bladder contractions (many health care providers prescribe these types of drugs first)
Alpha-adrenergic agonist drugs, such as phenylpropanolamine and pseudoephedrine (common ingredients in over-the-counter cold medications), help increase sphincter strength and improve symptoms in many patients. However, these drugs are rarely prescribed because of possible side effects on the heart.
Imipramine, a tricyclic antidepressant, works much like the alpha-adrenergic and anticholinergic drugs
Estrogen therapy can be used to improve urinary frequency, urgency, and burning in women who have gone through menopause. It also can improve the tone and blood supply of the urethral sphincter muscles.
However, it is not clear whether estrogen treatment improves stress incontinence. Some hormone treatments given after menopause have been shown more harmful than helpful to women's health. Women who have a history of breast or uterine cancer usually should NOT use estrogen therapy to treat stress urinary incontinence.
Surgery is only recommended after the exact cause of urinary incontinence has been found. Most of the time, your health care provider will try bladder retraining or Kegel exercises before considering surgery.
Anterior vaginal repair or paravaginal repair procedures are often done in women when the bladder is bulging into the vagina (called a cystocele). Anterior repair is done through a surgical cut in the vagina. A paravaginal repair is done through a surgical cut in the vagina or abdomen.
The condition may get in the way of social activities, careers, and relationships.
Calling your health care provider
Call for an appointment with your health care provider if you have symptoms of stress incontinence and they bother you.
Performing Kegel exercises (tightening the muscles of the pelvic floor as if trying to stop the urine stream) may help prevent symptoms. Doing Kegel exercises during and after pregnancy can decrease the risk of developing stress urinary incontinence after childbirth.
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.
Deng DY. Urinary incontinence in women. Med Clin North Am. 2011;95:101-109.
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.