The soreness of the back may be caused by overwork, such as prolonged heavy physical labor, or strenuous sports, which may cause the accumulation of lactic acid in the back muscles, which may lead to the symptoms of soreness and pain in the back. The soreness of the back may also be caused by cold, such as prolonged exposure to fans and air conditioners, which may cause the back to become sore and painful. Patients with coronary artery disease, for example, may suffer from angina pectoris due to myocardial ischemia, which often causes pain in the precordial region, and some patients may also have back pain. In addition, patients suffering from cholecystitis and gallbladder stones may also experience symptoms of back discomfort. In this case, the first thing to do is to take rest and avoid straining. In addition, if there are other symptoms, it is necessary to go to the hospital for further examination to clarify the diagnosis.