The small amount of menstruation 1 month after abortion should first be clarified whether it is menstruation, if it is not menstruation, it may be seen in the case of unwanted pregnancy. If it is determined to be menstruation but the volume is very small, it may be caused by endometrium not fully repaired, uterine cavity adhesion, or combined with other diseases, etc. 1, pregnancy: generally ovulation can occur within 22 days after abortion, and some people may have vaginal bleeding; if sexual intercourse has occurred during this period, it may cause another pregnancy, and a small amount of vaginal bleeding can be triggered when the fertilized egg is in bed, which requires checking HCG and ultrasound to help Diagnosis; 2. Uterus not fully repaired: the damage to the endometrium during the operation needs some time to repair, usually about 1 month will come to menstruation, in the case of endometrium not fully repaired, the amount of menstruation will be less, usually no special treatment is needed, 1-2 months can be observed to see if the menstruation returns to normal; 3. Cervical adhesions: intraoperative and postoperative infections, residues, etc. can lead to uterine adhesions, mild cases The menstrual flow can be reduced, the period can be delayed, and in severe cases, there can be amenorrhea, which requires timely hysteroscopic surgery to eliminate adhesions, and antibiotics such as metronidazole can be used to prevent infection.