Regurgitant cholecystitis is a chronic inflammation of the bile ducts due to stagnation of blood in the venous system of the liver and gallbladder. The disease progresses in waves and is fraught with the risk of stone formation. Caused by infection, parasites (roundworms) or simply stagnation of bile. It usually occurs after operations on the stomach and duodenum (gastroduodenoscopy, ulcers, etc.), in persons who have undergone peritonitis or cholecystectomy, rarely in a healthy person without any exposure. Infectious cholecystitis is only acute. Pain and pain with it reach a maximum within 2-3 days, less often lasting several weeks. Then attacks of pain follow at decreasing intervals, depriving the person of sleep and rest. Recovery takes weeks. The affected tissues become denser, bile pigments and breakdown products of red blood cells are concentrated in the bile, which leads to stone formation. The longer the disease continues, the higher the likelihood of the formation of “cobblestones.” Acute infectious cholecystitis ends with complete recovery in a period of several days to 3–4 weeks. Chronic lasts for months and years.