Lung cancer pain in the middle finger of right hand may be caused by cancer metastasis, side effects and other diseases, and it is recommended to take anti-cancer and drug treatments in time. 1. Cancer metastasis, after entering the advanced stage of lung cancer, the cancer cells will undergo systemic metastasis, such as metastasis to the middle finger of the right hand, which will cause pain and swelling if it destroys or squeezes the bone, so it is recommended to improve the examination and take treatment such as surgery and radiotherapy. 2. Side effects, such as patients in radiotherapy, chemotherapy and other treatments, drug side effects may have an impact on the fingers, thus causing pain in the middle finger of the right hand. Generally, mild pain can improve naturally without treatment. 3. Other diseases, some patients’ right middle finger pain is not directly related to lung cancer, but caused by tenosynovitis, arthritis and other diseases, which can be improved by acupuncture, physiotherapy and so on.