There are several possible causes of back pain under the shoulder: first, rib disease, when there is a tumor or metastasis in the rib cage, there can be pain in the rib walk under the shoulder, then the relevant CT and ECT examination of the rib cage should be performed for early diagnosis and treatment; second, herpes zoster, in the early stage of herpes zoster can also appear pain in the rib cage under the shoulder blade, then the relevant investigation should be performed, in Third, intercostal neuralgia, patients with intercostal neuralgia can have pain in the back under the shoulder where the intercostal nerve travels, so it is necessary to conduct early investigations for diagnosis and treatment. CT examination of the lungs should be performed for early diagnosis and treatment.