There are many causes of pain in the patient’s left breast, which is the pain in the anterior, left 4th and 5th ribs. For example, the patient’s left 4th and 5th ribs may be injured by direct external force or by a history of long-term chronic strain or trauma, which may result in intercostal muscle injury or intercostal neuritis or chondromalacia. In addition, if the patient’s local muscles are cold for a long time, qi stagnation and blood stasis and obstruction of meridians can also produce pain. During the treatment, the patient can be advised to reduce standing and weight-bearing activities and should rest in bed. The pain can be relieved by applying ointment to the painful area to activate blood circulation and eliminate blood stasis, reduce swelling and relieve pain, as well as infrared therapy and low and medium frequency electrotherapy.