There are many causes of post-partum urinary leakage, mostly considered to be due to pathologies such as unrecovered pelvic floor muscles, ligaments, etc., injury to pelvic floor muscles as well as injury to urethral muscles after delivery. 1. Pelvic floor relaxation: when a woman is pregnant, the growth and development of the fetus needs space and support, and the high abdominal pressure puts pressure on the pelvic floor tissues (muscles, ligaments, etc.), which leads to the relaxation of the pelvic floor muscles of the pregnant woman. 2. Pelvic floor muscle injury: During pregnancy or labor, the pelvic floor muscles and other tissues are needed to assist in support and contraction, which can easily cause damage to the muscles and other tissues, leading to post-partum urinary leakage. 3. Injury to urethral muscles: Pelvic floor muscle relaxation can also cause the urethral sphincter to close poorly, and there is also the possibility of damage to the urethral muscles during labor. If urine leakage occurs after delivery, it should be actively treated in the hospital.