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Cholecystitis is an inflammation of the gallbladder, an organ that helps break down fat. It usually occurs when a gallstone blocks the cystic duct. Symptoms include a sudden pain in the upper right-hand side of the abdomen, high temperature, vomiting, sweating, and yellowing of the skin. Initial treatment includes dietary changes, but in some cases, the gallbladder needs to be removed. For more info, go to www.nhs.uk.