Bile duct stones are more prevalent in the following groups: 1, people aged > 40 years old, due to age, this group of people will lead to abnormal bile metabolism, prone to bile stones; 2, obese people, especially women obese people, more prone to bile stones; 3, women with multiple births, due to hormonal and dietary changes in the body, prone to bile stones; 4, people with irregular life, such as many people do not eat breakfast, usually irregular life, also prone to bile stones.