Stress incontinence happens when certain muscles and other tissues linked to urinating weaken. These include the muscles that support the urethra, called the pelvic floor muscles, and the muscles that control the release of urine, called the urinary sphincter.
The bladder expands as it fills with urine. Most often, valve-like muscles in the tube that carries urine out of the body, called the urethra, stay closed as the bladder expands. This keeps you from leaking urine until you reach a bathroom.
But when those muscles weaken, anything that puts force on the stomach and pelvic muscles put pressure on your bladder. Sneezing, bending over, lifting or laughing hard, for instance, can cause urine leakage.
Female stress incontinence
In people assigned female at birth, the pelvic floor muscles and urinary sphincter may lose strength because of:
- Childbirth. Tissue or nerve damage during delivery of a child can weaken the pelvic floor muscles or the sphincter. Stress incontinence from this damage may begin soon after delivery or happen years later.
Male stress incontinence
In people assigned male at birth, the pelvic floor muscles and urinary sphincter may lose strength because of:
- Prostate surgery. Treatment for prostate cancer often involves surgery to remove the prostate gland, called a prostatectomy. This surgery is the most common factor leading to stress incontinence. This procedure can weaken the sphincter, which lies right below the prostate gland and goes around the urethra.
Other factors
Other factors that can make stress incontinence worse for males and females include:
- Illnesses that cause chronic coughing.
- Obesity.