Arm pain is not an early manifestation of lung cancer and is not clearly related to lung cancer. Most cases of arm soreness are caused by local soft tissue fascial inflammation, and may also be due to humeral epicondylitis or humeral medial epicondylitis and osteoarthritis. It may also be due to nerve root irritation caused by cervical spondylosis, resulting in pain, soreness and numbness in the forearm or upper arm. The main symptoms of lung cancer are respiratory symptoms, easily coughing, coughing up blood or accompanied by wasting symptoms. There are usually no symptoms in the early stage of lung cancer. If there is a history of smoking or second-hand smoke, people over 40 years old should go to the hospital for lung CT examination and regular screening after several years to pay attention to the early symptoms, which can help to detect early lung cancer and avoid missing the disease, so the arm soreness and pain are usually not directly related to lung cancer. It is more important to pay attention to sitting posture, avoiding prolonged neck flexion, ambulatory work and heavy lifting, which cause medial epicondylitis or lateral epicondylitis of the humerus, and avoiding muscle ligament damage. Therefore, it is necessary to treat the disease scientifically and conduct diagnosis and examination.