Pain at the end of the left side of the rib cage may be related to herpes zoster, lung disease, heart disease, bone fracture and so on. 1. Herpes zoster: if there is herpes zoster at the end of the left rib cage, it will cause nerve pain in the early stage, which can be manifested as pain symptoms at the end of the rib cage, and herpes will appear after the incubation period. 2. Lung diseases: such as pleurisy, lung tumors, etc. can also have pain symptoms at the end of the ribs. 3. Heart disease: when there is heart disease, myocarditis, pericarditis, etc., there may be pain at the end of the left side of the rib cage, and there may also be pain symptoms in the left back. 4. Fracture: Ribs may be fractured if they are impacted by external forces, which may cause pain symptoms. It is recommended to go to the hospital to do the relevant examination, identify the causes and then under the guidance of the doctor’s treatment, follow the doctor’s instructions.