Many young couples believe that a C-section delivery is less painful for the mother and safer for the child. Besides, it is not a big problem to have a scar on the uterus since there is only one child anyway. Unbeknownst to them, cesarean delivery without obstetric indications is not only not helpful for the safety of the child, but also adds to the harm of the mother. One of them is abnormal menstruation. After a cesarean delivery, about 20-30% of women experience abnormal menstruation. This is characterized by postmenstrual spotting or brown discharge lasting 3-10 days and bleeding after intercourse. This phenomenon may cause anxiety and fear in a significant proportion of women. Because of unclear menstruation and bleeding after intercourse, conjugal life is seriously affected. Even, the marriage lights up. Why does this abnormal bleeding occur after cesarean delivery? Cesarean delivery requires an incision in the lower part of the uterus to deliver the child. The healing process of the incision results in different degrees of scarring. Scar contracture causes deformation of the lower uterine segment and the formation of a niche diverticulum in the anterior wall of the lower uterine segment. This is somewhat like a pocket with an upward opening. Menstrual blood flows through here and some of it remains within the niche diverticulum. It is easy to understand that after normal menstruation, the menstrual blood remaining in the diverticulum will continue to flow out. This manifests itself as spotting and bleeding after menstruation and bleeding after intercourse. Knowing this, women with similar symptoms should be slightly relieved. Many times it is not a tumor growing in the uterus, but a cesarean scar diverticulum that causes menstrual abnormalities. Of course, we start the consultation with a series of tests to rule out tumors, endocrine abnormalities and other causes. For example, a cervical smear is done first to rule out cervical cancer. Then a vaginal ultrasound is done to provide an initial screening for the diagnosis of cesarean scar diverticulum. The vaginal ultrasound report will describe the presence or absence of a cesarean scar diverticulum and even the size of the diverticulum. If necessary, a hysteroscopy may be performed to confirm the diagnosis. Hysteroscopy often reveals a dome shaped change in the anterior wall of the cervix which should be smooth, with polyp growths. Most menstrual abnormalities due to cesarean scar diverticula do not require treatment. If the quality of life is severely affected, the hyperplastic mucosa of the posterior wall of the scar diverticulum can be removed by colposcopic surgery. This allows the diverticulum to open wider to facilitate the flow of menstrual blood. If the uterine wall is too thin in that area, the scar can be removed vaginally or laparoscopically. When the diverticulum is removed, the symptoms are reduced.