Cholecystosis, often referred to as cholecystitis, is the inflammation of the gallbladder, usually caused by the presence of gallstones that block the cystic duct. Symptoms can include abdominal pain, nausea, vomiting, and fever. If left untreated, it may lead to serious complications like infection or perforation of the gallbladder. Treatment typically involves dietary changes, medications, or surgical removal of the gallbladder.