Vague pain over the right breast excludes respiratory system diseases and circulatory system diseases. Respiratory system diseases are often related to breathing, and the pain is significantly aggravated by deep inhalation, and in addition to pain, it is accompanied by other symptoms of the respiratory system, such as cough, fever, and dyspnea. Circulatory system diseases are commonly seen in patients with heart attack and angina pectoris, where patients have pain in addition to a sense of near death, along with ST-segment changes on the ECG. Pain over the right breast may be due to costochondritis or costochondritis, or it may be due to breast disease, which is commonly associated with breast hyperplasia, which can cause vague pain, often around the time of menstruation. It can also be seen in fibroadenoma of the breast, which can also cause pain. Patients with acute mastitis can also experience pain, but it is often accompanied by redness and swelling. Usually breast cancer rarely causes pain, but it can also cause pain after it has attacked the nerves. Therefore, if you have pain over the right breast, you should consult a breast surgeon to complete the relevant examination and tests to determine the cause of the pain over the breast, so as to avoid missing the diagnosis and misdiagnosis.