If there is flesh-like tissue in the menstrual flow, it is often caused by the following reasons: First, it is caused by membrane-like menstruation, which is often caused by excessive activity of the endometrium, resulting in the shedding of large pieces of endometrium, so the flesh-like tissue seen in the menstrual blood is the endometrium. The second is caused by inflammation of the endometrium. When there is inflammation of the endometrium, large pieces of the endometrium may be shed during menstruation, so rotten flesh-like tissue may also be seen in menstrual blood. It is also important to note that if there is a history of temporary menopause and there is rotten flesh like tissue in the menstrual period, the possibility of miscarriage should be ruled out. It is advisable to have a blood test for HCG, if the blood HCG is more than 10mIU/ml, it indicates miscarriage.