There are many causes of left scapular pain, the most common being muscle strain and involvement pain from cervical spondylosis, and some of them may be caused by cancer. Malignant tumors in the lungs, such as lung cancer and malignant lymphoma, can stimulate the left posterior chest wall causing left scapular pain; in addition, metastatic or primary cancer of the scapula may also cause left scapular pain. Cancers such as lung cancer, breast cancer and prostate cancer that can easily metastasize to the bone should alert the patient to the possibility of bone metastasis if he or she has left scapular pain. Also malignant tumors that originate in bone or bone marrow, such as osteosarcoma and myeloma, may also cause scapular pain. Benign lesions of bone, such as shoulder joint inflammation, frozen shoulder, traumatic fracture, etc., may cause scapular pain. Therefore, to clarify the cause of scapular pain, patients still need to undergo relevant physical examination as well as CT, X-ray and other imaging examinations to be clear.