Cholecystitis is the inflammation of the gallbladder, often caused by the presence of gallstones that block the bile ducts. Symptoms typically include severe abdominal pain, nausea, vomiting, and fever. Acute cholecystitis can be a serious condition requiring prompt medical attention, often leading to surgical removal of the gallbladder (cholecystectomy). Chronic cholecystitis may develop from repeated episodes of acute inflammation.