There are several causes of pain under the right rib cage: 1. The right rib cage is considered to be in the liver and biliary area, and pain can occur mainly when liver and biliary problems occur, such as acute cholecystitis, acute hepatitis, viral hepatitis, liver cirrhosis, and liver tumors. It is recommended that an ultrasound examination of the abdomen be performed to understand the situation, as well as liver function tests.2. The pain under the right rib cage is considered to be caused by trauma, damage, contusion and intercostal neuralgia, and it is recommended that a radiograph be taken to understand the situation.