Causes of left and right back pain; first, consider orthopedic problems, clinically common chronic inflammation of the muscles and fascia of the scapular muscles of the back, as well as strain on the supraspinatus ligament and interspinous ligament, leading to pain in the back, commonly found in middle-aged people who have more labor intensity and incorrect sitting posture. Secondly, some internal diseases may also lead to pain in the back. Clinically, the more long-standing cardiac problems, such as coronary heart disease, angina pectoris, myocardial infarction, thoracic aortic aneurysm, aortic coarctation, and so on, can be manifested as pain in the back in rare cases, which must be emphasized, as the missed diagnosis may lead to the patient’s life being endangered. Then, cervical spondylosis compressing the nerve roots and radiating to the back of the shoulder can also cause pain, and subacromial bursitis leading to localized inflammation can also cause significant shoulder and back pain. Finally, in rare cases, pulmonary embolism can be a cause of back pain, but the incidence of this condition is very low.