If a patient has pain in the ribs by the left breast, the following factors should be considered: 1. cardiogenic factors, because factors such as coronary atherosclerotic heart disease, myocarditis, pericarditis, infective endocarditis or hypertrophic obstructive cardiomyopathy cause myocardial ischemia, which can lead to pain in the ribs by the left breast due to ischemia and itching when the blood supply to the heart is inadequate. 2. respiratory factors, such as When there is an infection in the lungs, such as lobar pneumonia, mycoplasma pneumonia, and in cases of pleural effusion, pneumothorax, etc., there will also be 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.