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In page Urinary incontinence:

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For example, stress urinary incontinence is usually a result of the incompetent closure of the urethral sphincter. This can be caused by damage to the sphincter itself, the muscles that support it, or nerves that supply it. In men, the damage usually happens after prostate surgery or radiation,[3] and in women, it's usually caused by childbirth and pregnancy.[4] The pressure inside the abdomen (from coughing and sneezing) is normally transmitted to both urethra and bladder equally, leaving the pressure difference unchanged, resulting in continence. When the sphincter is incompetent, this increase in pressure will push the urine against it, leading to incontinence.[citation needed]