Pain in little thumb is usually not a symptom of lung cancer, it may be caused by tenosynovitis, purulent dactylitis and so on. 1. Lung cancer: the disease may be caused by smoking, air pollution, ionizing radiation, heredity and other factors. Lung cancer may have no obvious symptoms, and when the disease is developing, patients mainly show symptoms such as blood in sputum, irritating dry cough, chest pain and so on, which will not cause pain in little thumb. 2. Tenosynovitis: In life and work, due to excessive friction caused by frequent activities, aseptic inflammatory reaction such as congestion and edema will occur, thus causing pain in the little finger, and patients usually have symptoms such as localized pain and limitation of joint activities. 3. Purulent dactylitis: when the patient has an injury or a foreign body secondary to bacterial infection, it can cause purulent inflammation, resulting in pain in the pinky, and with the development of the disease, the tissues are swollen, and there will be severe throbbing pain. It is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s specific condition performance, to take targeted treatment.