If a patient has pain in the ribs by the left breast, the following factors should be considered: 1. The most important factor is the cardiogenic factor, because factors such as coronary atherosclerotic heart disease, myocarditis, pericarditis, infective endocarditis or hypertrophic obstructive cardiomyopathy lead to myocardial ischemia, which can cause pain at the ribs by the left breast due to ischemia and itching when the blood supply to the heart is inadequate. 2. Respiratory Factors of origin, such as infection of the lungs, such as lobar pneumonia, mycoplasma pneumonia and other cases, as well as pleural effusion and pneumothorax, will also cause pain in the ribs on the left side of the breast, and the pain is usually related to breathing. Common chest wall diseases such as costochondritis and even herpes zoster can also cause pain here.3. Women with lobular hyperplasia in the left breast, for example, or with occupancy of the breast, can also experience pain in these areas.