Patients with left back subscapularis pain may be related to a variety of factors, common causes are as follows: 1, chest wall disease: if the above pain symptoms and patients bending, coughing, deep breathing or local pressure and other postural changes, it is usually due to the thorax or chest wall skin, muscle, nerve, bone, fascia and other tissues and organs caused by disease; 2, visceral disease: may be related to the patient’s heart, pleura, lung, large blood vessels Even esophageal and other visceral diseases, if it is a long-term patient with hypertension and diabetes, it is more likely to have heart disease, and coronary heart disease can be considered when there is pain in the subscapular angle of the left back; 3, psychosomatic factors: if the above pain is related to emotional, sleep, tension, anxiety or rumination and other psychosomatic factors, the patient does not have pain when pressing the local area, and there is no obvious hypertension, diabetes, or Arteriosclerosis and other risk factors, then the pain is usually caused by mental emotions.