What is the cause of stress urinary incontinence?

Pregnancy and childbirth lead to the weakness of pelvic floor support system and the insufficiency of muscle inclusion function. The incidence rate of postpartum women is about 30%. The risk of illness gradually increases with age. The incidence rate of middle-aged and elderly people over 50 is nearly 60%. Chronic urinary incontinence can cause vulvar inflammation, itching, body odor and even infection, and is known as "social cancer".