Itchy skin will appear in the late stage of lung cancer, but it is not excluded that it is caused by skin diseases or dry weather and other factors. 1. Late stage of lung cancer: mostly due to the damage of tumor to the organism, the skin lacks nutrition and itchy symptoms appear; it may also be due to the obstruction of bile duct caused by tumor and obstructive jaundice, which manifests itself as itchy skin, accompanied with symptoms such as yellow staining of sclera of the skin, yellowing of urine, abdominal pain and so on. It may also be the cause of abnormal hormone secretion, causing skin itching. 2. Skin diseases: common skin diseases such as eczema, urticaria, dermatitis, etc., will show itching of skin, which may be accompanied by papules, erythema and other symptoms. 3. Dry weather: patients with lung cancer have low resistance in the late stage, and dry weather can easily cause skin dehydration and dryness, which will lead to itchy skin symptoms. There are more factors of itchy skin in the late stage of lung cancer, which should be diagnosed and treated by doctors. Regular review is necessary in daily life to facilitate monitoring the changes of the condition.