Stress incontinence is extremely common. Approximately 60 percent of women experience some leakage with activity at some time in their lives. However, stress incontinence is not uncommon in women in their 20s and 30s. Risk factors for stress incontinence include pregnancy and childbirth, repetitive heavy lifting, constipation, a chronic cough, and even a family history of stress incontinence.
Stress incontinence is caused by a weak urethra. The urethra is the tube through which urine leaves the bladder and then leaves your body. The function of the urethra is to stay closed against the bladder when at rest and during activities such as exercising and coughing. When you have stress incontinence, the urethra is not strong enough to stay closed against such forces.
A weak urethra can be the result of loss of support underneath the urethra, or as a result of a weakness in the sphincter muscles of the urethra—or both. Additionally, stress incontinence can result from weakening or loss of effectiveness of the pelvic floor muscles (also known as the Kegel muscles).
The severity of leakage can vary greatly. For some women it can require a severe stress such as running a marathon or a powerful sneeze. In others, the simple motion of rolling over in bed can cause the loss of urine. There is no specific amount of leakage that is considered a cutoff for treatment. The problem is severe enough to be treated when you want it treated, whether it is 20 times daily or 20 times yearly.
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