Itching all over the body once you go to sleep is not a precursor of cancer. It is usually due to skin problems, mostly considering whether it is related to underlying diseases or whether it is related to skin diseases, and is usually not an early manifestation of cancer. In most cases, itchy skin is firstly considered to be caused by the lowered immunity of the body, resulting in poor skin metabolism; or there are other underlying diseases, such as uremia and cirrhosis, but it is not related to the time, and is mostly a symptom accompanying the whole day. Most cancers are already in the middle and late stages when they are discovered, and it is difficult to treat them. When skin itching occurs, if it is accompanied by skin lumps or painful sensations, or even high fever that persists, and coughing and difficulty in swallowing, it is considered that it may be caused by cancer, and you should go to the hospital as soon as possible for a comprehensive examination to clarify the specific cause and treat it as soon as possible. However, if it is just a simple itching of the skin, it is mostly not related to cancer. Pay attention to personal hygiene in daily life, bathe and change clothes regularly, keep skin moist, avoid dryness, be in a soothing mood and bedding should be washed and dried regularly to avoid breeding bacteria and avoid most skin itching.