Pain in the middle of the rib cage below the chest can be seen in the following conditions: the first, pleurisy needs to be considered, pleurisy is a breathing-related chest pain that worsens when the patient inhales deeply, coughs and turns the position, and disappears when the chest pain disappears when the breath is held. The second, pain in the middle of the ribs below the left chest, requires attention to coronary artery disease, including angina pectoris and acute myocardial infarction, and chest pain often in the apical region or at the lower end of the sternum. Generally, if it is angina, the duration is short and can be relieved in a few minutes; in acute myocardial infarction, the duration is relatively long and can last from ten minutes to half an hour or even longer, and the pain is severe. The third type, pain in the lower part of the chest, also pay attention to the presence of costochondritis, or shingles.