Pain behind the right rib cage may be caused by intercostal neuritis, which is caused by aseptic inflammation of the intercostal nerves, or by herpes zoster, which is caused by infection with the herpes virus that causes blisters on the surface of the rib cage, with pins and needles and redness of the surrounding skin. The pain may also be caused by inflammation of the pleura, which is a common cause of infection in the thoracic cavity, resulting in inflammation of the pleura and painful friction of the pleura during breathing, often located in the lateral posterior aspect of the thorax. If the pain is located behind the ribs on the lower right side, it may also be a liver lesion. The liver is located on the right side of the quarter ribs, and if there is hidden pain behind the rib edge, accompanied by loss of appetite and weight loss, it may be caused by liver disease, and it is recommended to visit a regular hospital to clarify the condition.