The pain behind the right rib can be caused by the following reasons: first, herpes zoster, in the early stage of herpes zoster, there can be pain on one side of the ribs, in the incubation period of 1-2 weeks after the appearance of herpes, then to the dermatology department for diagnosis and early treatment. Second, gallbladder disease, when the gallbladder has cholecystitis or gallbladder stone attack, there can be a side of the rib back pain, can be accompanied by the same side of the shoulder radiating pain, this time to check the gallbladder ultrasound, CT to diagnose and treat. Third, rib disease, when there is tumor or metastatic tumor in the rib, there can be pain at the back of rib on one side of the rib, which should be examined by CT and ECT of rib to diagnose. Fourthly, lung disease, when there is tumor in lung or tumor in pleural cavity, there can also be pain at the back of one side of the rib, then the CT of lung should be examined to diagnose and treat.