Chest muscle pain may be caused by chest wall muscle spasm, rib abnormality, trauma and so on. 1. Chest wall muscle spasm: It may be due to the patient keeping a certain posture for a long time, such as writing, bending over and other situations, or it may be due to violent coughing and other reasons, resulting in spasm caused by the strain of the chest muscle. When the patient takes a deep breath or exercises, the symptoms will be aggravated. 2. Abnormal ribs: when the patient has costochondritis, it may cause thickening and bulging of the ribs, which may stimulate the muscles to show swelling, pain and other symptoms, usually lasts about one month, and can be treated with amoxicillin capsules. 3. Trauma: when the patient due to external impact, may lead to chest muscle pain symptoms. Patients with chest muscle pain should follow the doctor’s instructions to use medication, change the bad posture, and seek medical attention when the symptoms worsen.