Pain below the right rib cage when breathing generally has the following two causes: first, pleurisy, if inflammation of the lung or tuberculosis secondary to pleurisy, then pain below the right rib cage will occur, and laboratory tests as well as observation of fever or loss of appetite, wasting and other symptoms will be performed to further confirm the diagnosis. A CT examination of the lungs should also be performed to observe whether there is an inflammatory reaction or fluid accumulation in the pleura. Second, whether it is the early stage of herpes zoster, in the early stage of herpes zoster, there will be obvious pain when breathing under the rib cage, early symptomatic treatment should be carried out to observe whether there are clusters of blisters appearing, if there are clusters of blisters appearing, it is necessary to visit the dermatologist to further confirm the diagnosis and treatment.