The discharge of blood and flesh-like tissue similar to pig’s liver during menstruation is mostly caused by membranous menstruation. Excessive activity of the endometrium or inflammation of the endometrium will lead to a large piece of the endometrium falling off, and tissue similar to rotting flesh will be seen in the menstrual blood, which is often accompanied by dysmenorrhea, and the symptoms of dysmenorrhea will be reduced significantly after the tissue is discharged. It is recommended to exclude the possibility of miscarriage, when there is a history of menopause may be due to pregnancy, more than a few days after menstruation and vaginal bleeding, mistaken for menstruation is in fact a miscarriage, the outflow of tissue is recommended to bring to the hospital to do pathological examination.