Miscarriage means abortion avoidance and aunt means menstruation. It may be normal for the first period after abortion to be black, but pathologic conditions such as infection and uterine adhesions cannot be ruled out. After miscarriage, women may have transient endocrine disorders, and the level of estrogen may be lower before recovery, resulting in a thinner uterine lining and thus a smaller menstrual flow. A small amount of menstrual blood that stays in the vagina for a long time will oxidize, resulting in a situation where the first period after miscarriage is black. If a woman is weaker after abortion or does not pay attention to local hygiene, infection may be induced, and the situation of the first menstrual period after abortion being black, mostly accompanied by abdominal pain, abnormal vaginal discharge and other symptoms, which is usually abnormal. If a woman has a miscarriage, the damaged endometrium is partially adhered, resulting in a thinner endometrium, and thus a lower menstrual flow, which may be accompanied by symptoms such as abdominal pain and poor menstrual flow during menstruation. If a woman’s first period after abortion is black and accompanied by the above symptoms, it is recommended that she consult a doctor in time, and under the guidance of the doctor, complete the relevant examinations to clarify the cause of the disease and treat it.