Postmenstrual bleeding can be caused by pregnancy, such as pre-eclampsia, ectopic pregnancy or biochemical pregnancy, which may result in irregular vaginal bleeding. Postmenstrual bleeding can also be caused by organic lesions, such as uterine scar diverticulum formation after cesarean section or endometrial polyps or submucosal fibroids, which may cause postmenstrual vaginal bleeding. Postmenstrual bleeding can also be seen in ovulatory bleeding, especially in the middle of menstruation. It can also be caused by poor luteal function and requires further basal body temperature monitoring for a clear diagnosis.