Itchy skin does not necessarily mean cancer, and there is usually no need to be particularly alert to the early stages of cancer if only itchy skin is present. Itchy skin may be caused by physiological factors such as dry weather, or by diseases such as eczema, neurodermatitis and jaundice. 1. Physiological factors: If the weather is too dry, it may lead to excessive loss of water in the human body, resulting in itchy skin. 2. Eczema: the cause of the disease is not clear, may be related to genetic, immune abnormalities and other factors, the patient will be localized erythema, edema, papules and other symptoms, accompanied by intense itching. 3. Neurodermatitis: the etiology is not clear, may be related to friction, scratching, mental factors, etc., the patient will appear locally single or multiple flat papules fusion of mossy skin, often feel a burst of intense itching. 4. Jaundice hepatitis: the etiology may be related to viral infection, drug damage, autoimmune damage and other factors, the patient will appear generalized discomfort, loss of appetite, nausea, itchy skin and other symptoms. For patients with itchy skin, they should go to regular hospitals for consultation and examination to clarify the cause of the disease and then treat the symptoms.