Pain under the right rib cage in the heart fossa is most often seen in diseases of the hepatobiliary system, such as viral hepatitis or liver enlargement. If the patient is also suffering from loss of appetite, abdominal distension and other symptoms, after a short period of observation, such symptoms do not ease or are accompanied by other discomfort, you need to go to the hospital for liver function as well as hepatobiliary ultrasound in time to detect or exclude diseases of the hepatobiliary system.