It is not possible to specifically determine the duration of the onset period of bile duct dilatation, which needs to be analyzed in conjunction with the severity of the disease and the individual’s physical condition. As a common bile duct abnormality, bile duct dilatation is related to heredity, congenital bile duct developmental abnormality and bile duct obstruction, etc. The clinical symptoms are usually abdominal mass, abdominal pain and jaundice. Clinical symptoms are usually abdominal mass, abdominal pain and jaundice, all intermittent. Symptoms are reduced or disappear when bile is discharged smoothly. The time between attacks varies, and may be frequent or asymptomatic for a long time. It is recommended that patients who are not feeling well should consult a doctor in time for standardized treatment under the guidance of the doctor. Avoid foods high in cholesterol and fat in diet. Patients should also pay attention to rest, maintain sufficient sleep, do not stay up too late and overwork.