If there are symptoms of pain under the left rib cage, there are several clinical possibilities: i. Costochondritis and intercostal neuralgia of the left lower rib cage can lead to symptoms of pain under the left rib cage. Second, skin lesions including skin damage and shingles can also lead to pain under the left rib cage. Third, lung diseases including inflammation, tumor, tuberculosis, and injury of the left lung can also cause a person to experience symptoms of pain under the left rib cage. Fourth, angina caused by coronary heart disease can also lead to pain under the left rib cage, coronary heart disease is the short form of coronary atherosclerotic heart disease, if there are a variety of reasons for the lack of blood supply to the myocardium, resulting in angina pectoris attack, which will be manifested in the left side of the rib cage below the symptoms of pain, the symptom is mostly associated with emotional tension, agitation and strenuous exercise has a clear correlation.