The unclear uterine cavity line is considered to be related to the postmenstrual period, after uterine operation surgery, uterine cavity adhesion, etc., which is manifested as blurred and unclear uterine cavity line; most of the unclear uterine cavity line is found by ultrasound examination without typical clinical symptoms of patients. 1. After menstruation: after a woman’s normal menstruation, if the ultrasound examination also shows that the uterine cavity line is unclear, usually the patient does not have typical clinical symptoms, which is a normal physiological manifestation and does not require treatment. 2. Post-operative uterine operation: mainly after abortion or scraping surgery, ultrasound examination of the uterine lining is not clear, with the further recovery of the uterus after the operation, there will be a clear line of the uterine cavity gradually. 3. Uterine cavity adhesion: unclear uterine cavity line may exist in the uterine cavity adhesion, may be manifested in low menstrual flow, dysmenorrhea and other symptoms, need to carry out hysteroscopy to confirm the diagnosis. If there are symptoms such as abnormal menstruation, it is recommended to consult a doctor in time.