Gallstones are definitely not contagious. From the point of view of infectious diseases, there are three key conditions, a source of infection, a means of transmission, plus a susceptible population. There is no clear source of infection for gallstones because they are formed by an imbalance in the dissolution of bile acids and cholesterol in the human body, and they do not carry any microorganisms or parasites, so there is no source of infection. The so-called infectious diseases usually have a clear transmission route, such as through bodily fluids, droplets or blood, but at present, there is no clinical evidence to prove that patients with gallstones can be transmitted through bodily fluids, droplets and blood, and there is no so-called susceptible population, which means that there is no infectious source of gallstones, and there are no transmission routes, so it will not be contagious at all. Therefore, gallstones are not an infectious disease and will not cause infection.