If the uterine cavity is separated by 2mm, it means that there is fluid in the uterine cavity, but the amount is relatively small.1. If this situation is detected by ultrasound when the menstruation is clean for about 3 days, it means that there is a small amount of residual menstrual blood in the uterine cavity, and the ultrasound should be back to normal if the situation is reviewed after 1 week.2. If the uterine cavity is separated by 2mm after the miscarriage, it means that there is also blood in the uterine cavity, and the patient needs to take oral medication, such as motherwort granules or new biochemical granules, to promote uterine contraction and eliminate the blood in the uterine cavity. If you have a miscarriage and the uterine cavity is separated by 2mm, there is blood in the uterine cavity, you need to take oral medication such as motherwort granules or new biochemical granules to promote uterine contraction and eliminate the blood in the uterine cavity, and then do pelvic ultrasound for review after 1 week of medication.3.