Urethral diverticulum may be related to congenital causes or acquired causes such as urethral obstruction, trauma and infection. 1. Congenital causes: abnormal embryonic development may cause congenital urethral diverticulum, resulting in periurethral and urethral communication. 2. Acquired causes: women are mostly associated with urethral obstruction, urethral gland infections and other causes of cysts, severe penetration into the urethra to form urethral diverticula. Men are often associated with urethral stenosis, urethral hypospadias and other cystic dilatation and the formation of urethral diverticula, but also by urethral infection, urethral trauma and other abscesses caused by the urethra and damage to the urethra, causing urethral diverticula. When suffering from urethral diverticula, the cause should be clarified under the guidance of a doctor so that it can be treated actively.