The statement “left elbow pain is a warning against four types of cancer” is inaccurate and has no scientific basis. Left elbow pain alone is not necessarily cancer. Left elbow pain can be caused by trauma, or by diseases such as medial epicondylitis of the humerus or elbow-tube syndrome. Left elbow pain is usually not strongly associated with cancer, and symptoms are usually not apparent in the early stages of cancer. Pain in the left elbow is caused by excessive or frequent movement of the left elbow joint, external impact, etc. This is a normal physiological phenomenon and can be relieved after a period of rest. Wear and tear of the ulnar nerve can lead to thickening of the fibrous bands at both ends of the ulnar flexor carpi ulnaris muscle, and the ulnar nerve will be compressed, resulting in elbow canal syndrome, causing pain in the left elbow, which can be improved by functional exercises or surgical treatment. The left elbow pain may also be caused by repeated forceful grasping, forearm rotation and wrist flexion, resulting in medial epicondylitis of the humerus. The pain can be relieved by hot compresses and physical therapy, or treated with oral nonsteroidal anti-drugs, such as ibuprofen and diclofenac sodium. When left elbow pain occurs, you should go to the hospital in time to identify the cause of the disease and treat the symptoms. Please strictly follow the doctor’s instructions for medication, and do not use medication on your own.