Breast pain may exist for a number of reasons such as: 1, mental stress, prolonged mental stress can cause abnormal sensations in the body may be tingling in the breasts, need to carry out appropriate relaxation, rest. 2, heart disease, if the left side of the breast pain should be vigilant about cardiac disease, if accompanied by panic attacks, weakness, we must promptly consult a doctor for cardiac ultrasound examination. 3, lymph nodes, lymph nodes by the breasts will be affected by inflammation, pain, swelling can be moved. The lymph nodes on the side of the breast will be affected by inflammation, and they will be painful and enlarged and can be moved. After the inflammation is eliminated, the pain will disappear naturally, but the enlarged lymph nodes are not easy to disappear, and can be surgically removed.4, breast diseases, such as mastitis, breast hyperplasia, breast cancer. Milk stagnation will cause inflammation in the ducts, and in severe cases, pus will be produced, which requires anti-inflammatory and pus drainage treatment, and breast cancer requires mastectomy.