The urethra is a tube through which urine, stored in the bladder, is passed outside the body. A urethral stricture is an abnormal area of constriction along the length of the urethra that reduces or obstructs the flow of urine. It is more common in males as the urethra is longer, passing through the penis and prostate gland.
Urethral strictures usually occur due to inflammation and scar formation in the urethra. This can occur with the introduction of penile implants, catheters, previous surgery to the urethra, prostate surgery and injuries close to the scrotum. Those with enlarged prostates and sexually transmitted disease such as gonorrhoea and syphilis have an increased risk of developing a stricture.