For women who have the need to insert a catheter should not insert it themselves, as this may lead to serious consequences such as urethral injury. The indications for urinary catheterization are all kinds of lower urinary tract obstruction caused by urinary retention, preoperative preparation for gynecological or other surgical procedures, urethra or cystography, retention of uncontaminated urine for bacterial culture, intravesical instillation of medication or bladder irrigation, etc., which is a rigorous medical operation. Moreover, the perineum needs to be strictly cleaned and sterilized before the operation of urinary catheterization. Non-professionals or self-operation may lead to inadequate sterilization, which may bring bacteria into the urethra and cause infections, or excessive force or roughness may cause damage to the urethra or even rupture of the bladder, so self-insertion of the urinary catheter is not recommended. For patients who need to have a urinary catheter inserted, it is recommended to go to a regular hospital and have it done by a professional, not by yourself.