There are many causes of pain under the right rib cage, and usually, elderly people who experience discomfort need to be examined promptly. Pain under the right rib cage is usually a liver and gallbladder problem, of which cholecystitis is extremely common, and it is recommended to go to the hepatobiliary surgery department first to clarify the condition promptly, and also to consider gastritis, peptic ulcer and other gastrointestinal disorders causing such conditions.