Pelvic floor muscle relaxation without children may be congenital dysplasia, abdominal pressure for a long time, age, obesity and other reasons. 1. Congenital dysplasia: some women have congenital dysplasia of their pelvic cavity, resulting in pelvic floor muscle relaxation even if they have not had children. 2. Increased abdominal pressure: women who have not given birth to children are engaged in heavy labor for a long time, suffer from chronic cough and constipation and other diseases, the abdominal pressure is in a state of increased for a long time, which will also cause the pelvic floor muscle relaxation. 3. Age: some women have not given birth to children, but with the growth of age, the body functions decline, the pelvic floor muscle function gradually aging, will also appear the performance of the pelvic floor muscle relaxation. 4. Obesity: women have not given birth to children, but usually often overeat, the body overweight accumulation of excessive fat, increase the pelvic load, will also lead to pelvic floor muscle relaxation. Pelvic floor muscle relaxation causes more, serious cases are recommended to seek timely medical treatment.