Children’s fever after the whole body itch may be hives, drug allergies, other skin diseases and other reasons. 1. Urticaria: fever body temperature rises, can trigger urticaria, resulting in itching all over the body, patients may also be accompanied by diarrhea, abdominal pain and other symptoms. 2. Drug allergy: children with fever in the process of application of certain drugs, the child may be allergic to some components of the drug, resulting in itching, may also appear rash and other symptoms. 3. Other skin diseases: if the child himself suffers from eczema and other skin diseases, when the fever capillary expansion, may make the previous eczema aggravation, the child will produce itching. Children’s fever after the whole body itch, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.