Hi dear thanks for asking question... I appreciate you as you want to study of cholelithiasis. I can explain you in simple way..... See stone in bile duct or gall bladder is of two type cholesterol or pigment.... Liver secrete bile salt that in gall bladder help in dissolving cholesterol in bile by Micelle formation .... If capacity exceeded or supersaturation of bile ex....in obese, pregnancy , gall bladder stasis etc...then stone develop. If person having hemolysis then increase bilirubin in bile firm calcium bilirubinate stone....Ex.in sickle cell , thal, spherocytosis etc..causes... In cholelithiasis pain in abdomen after eating present... By indigestion bloating and constipation can occur.... I hope my answer satisfy you... If still query you can contact us.... Dr.Parth Goswami