Menstruation like black mud is considered to be caused by chronic endometritis, vaginitis, blood stasis, poor discharge of menstrual blood, cold in the abdomen, and cold in the uterus. When women suffer from chronic endometritis and vaginitis, the inflammatory stimulation will lead to increased secretion from the uterus or vaginal mucous membrane zou wall, plus the menstrual blood will easily appear like black mud menstruation. Women in the blood stasis physique, the uterine cavity has stagnant blood or poor menstrual blood discharge, in the uterine cavity accumulation easy to appear black mud-like menstruation. If a woman has cold in the uterus or suffers from cold in the abdomen during menstruation, causing her menstruation to fall out in clots, she may also have black mud-like menstruation. Black mud-like menstruation can be accompanied by various degrees of abdominal pain, increased menstrual flow and back pain. Once black mud-like menstruation occurs, the cause should be identified as soon as possible. Anti-inflammatory treatment is recommended for inflammation, while blood stasis treatment is recommended for blood stasis.