What factors are associated with bile duct stones? What causes the occurrence of bile duct stones is a topic of concern to many patients, in fact, it is difficult to say what the cause is, but according to the current medicine can be considered related to the following factors: 1. This results in a less smooth outflow of bile than the right hepatic duct, resulting in a relatively stagnant state of bile, which further promotes stone formation. The incidence of right posterior lobe bile duct stones is higher than that of right anterior lobe bile duct stones, which is also a factor. 2, individual physical factors: Why do some people have bile duct stones, while others do not? This has a lot to do with the individual’s constitution, and can be understood from another perspective that this part of the patients with bile duct stones have a long stone constitution, even if the surgery is done well, and then the stones recur again is also a factor of this. 3, bile composition factors: gallstones are divided into bile pigment stones, cholesterol stones, bile pigment and cholesterol mixed stones, normal bile has many components in balance, if some components change, it will lead to the balance in the bile disorder, and thus the appearance of related stones. 4, biliary foreign body factors: some patients have had a history of biliary roundworm, resulting in the remains of roundworm residue in the biliary tract, with the core of roundworm residue can produce stones. 5, water and soil regional factors: the incidence of bile duct stones in the northwest is significantly higher than in the south, which can not be said to be unrelated to the water quality and factor habits in the northwest, however, this is not something that any person can prevent or change.