A red and itchy body may be caused by allergic rashes, hives and so on. 1. Allergic rash: also known as drug rash, with genetic factors, drug factors, personal constitution, etc., generally stop using allergenic drugs can be self-healing. Its main manifestation is a dense, symmetrical distribution of red spots, macules, can be all over the body, accompanied by itching, can also be accompanied by rash tenderness, abdominal pain, nausea, vomiting, panic, dyspnea and other symptoms. This can cause a red body also itchy. 2. Urticaria: commonly known as rubella, is the skin and mucous membranes due to temporary vascular permeability increase and the occurrence of limited edema, the majority of patients can not find the specific cause of the disease, which can be caused by food, drugs, infections, physical factors, mental and endocrine factors. Its main manifestations are red red air masses of varying sizes, accompanied by skin itching, and in severe cases, panic, irritability, shock, abdominal pain, nausea and other symptoms can occur. It can also cause a red and itchy body. There are many other causes of a red and itchy body, should be taken seriously, it is recommended to consult a doctor in time to identify the cause of the disease, and follow the doctor’s instructions for further treatment or therapy.