The common causes of pain in the upper part of the breast include bone disease, heart disease, respiratory disease and breast disease. 1. Bone diseases: subcutaneous soft tissue, bone or cartilage lesions in the chest, such as fractures, costochondritis, muscle injuries, etc., can cause vague pain in the upper part of the breast. 2. Heart disease: myocardial infarction, coronary heart disease, etc., especially after emotional excitement or overwork, angina pectoris can occur, which can be manifested as a typical vague pain in the upper chest. 3. Respiratory diseases: lung abscess, pleurisy, pneumothorax and even lung tumors can cause vague pain in the upper breast as the disease progresses. 4. Breast diseases: Women may also experience vague pain in the upper breasts due to mastitis, breast hyperplasia and other diseases. It is recommended to consult a doctor as soon as possible for a clear diagnosis of vague pain in the upper part of the breasts.