If a piece of flesh-like tissue falls out during menstruation, it is commonly seen in the following cases: The first cause is due to membranous menstruation, where a large piece of the endometrium is shed during menstruation due to excessive activity of the endometrium or due to inflammation of the endometrium, so that the flesh-like tissue falls out of the vagina during menstruation. The second reason is that it is possible to be pregnant at the time of menstruation, which is the result of a spontaneous abortion. It is recommended to send the discharged tissue to the hospital for further observation to find out whether the tissue is more likely to be miscarriage or endometrium, and if necessary, to send it for pathological examination, and then to treat it accordingly in combination with the clinical results of blood HCG.