How does menstruation not return a responsibility

Normal menstrual cycle is 3 to 7 days. If more than 7 days, generally called menstrual. There are Caesarean diverticulum, endometrial polyps, cervical vegetation, may cause menstrual not enough, need to do B ultrasound and gynecological examination, cervical cancer screening. Caesarean section women, diverticulum, general menstrual time will be longer, some can last up to 15 days or so. This is a surgical complication, can be treated by oral contraceptives, can also be treated surgically. Endometrial polyps, need hysteroscopy polyps sent pathological examination. Cervical polyps need colposcopy cervical resection.