Causes of sore chest muscles include chest muscle strain, lung infections, colds, and malignant tumors in the chest. There are different modalities for different causes. Common treatments include general treatment, medication, surgery and so on. 1. Pectoral muscle strain: Long-term work at desk, excessive exercise intensity, etc., can lead to pectoral muscle strain, lactic acid accumulation and lead to chest muscle soreness. Patients can stretch the chest muscle, hot compresses and massage the affected area, which can help relax the chest muscle and accelerate the decomposition of lactic acid, thus relieving the soreness. 2. Lung infection: local tissues are congested and swollen after lung infection. If the inflammation site is close to the chest muscle, the inflammation spreads to the chest or the inflammatory cells stimulate the nerves, it is easy to lead to chest muscle soreness, which can be accompanied by fever. Patients should follow the doctor’s instructions to choose the appropriate medication to control the infection. Common drugs include cephalosporin, ceftazidime and other cephalosporins, roxithromycin and other macrolide antibiotics. 3. Colds: Colds can cause muscle aches and pains, including the chest muscles. Violent coughing during a cold may also cause damage to the pectoral muscles. Patients with colds can drink warm water, take cold medicines such as Xiao Chaihu and cold spirit granules, and pay attention to keeping warm and preventing cold. 4. Malignant tumor of chest: malignant tumor of chest invades the pleura and chest wall muscle, which will lead to chest pain and discomfort. This kind of patients should consult the doctor in time and choose to be treated by means of resection, chemotherapy or radiotherapy under the doctor’s guidance. Chest muscle soreness may also be caused by breast hyperplasia. Patients with sore chest muscles are advised to go to the hospital for timely diagnosis, identify the cause of the disease and choose the appropriate treatment under the guidance of the doctor.