The structure of the uterus from the outside in includes three layers: the serosa, the muscle layer and the innermost mucosal layer. When the mucosal layer is damaged, the uterine cavity sticks together and the uterine cavity narrows, it is called uterine adhesion. Uterine adhesion often occurs in women who have had uterine interventions such as abortion, uterine fibroid removal or due to prolonged gynecological infections.