Pain in the left arm and back can be caused by local soft tissue injury, pain due to cervical spondylosis, or pain in the left arm and back due to coronary artery disease or having a disease such as a major artery. Since the blood pressure is not controlled to the normal range, it causes left arm and back pain as a tearing-like sensation and requires immediate medical attention if it cannot be relieved. Back pain is a common symptom, such as thoracic spine trauma, fracture, tuberculosis, tumor, etc. However, the left arm combined with back pain is commonly caused by neurogenic cervical spondylosis, which is caused by compression of nerve roots, but it is also necessary to be alert to the possibility of heart disease, and it is recommended to go to the hospital for an MRI of the cervical spine as well as an electrocardiogram.