Itchy body after vaccination may be an adverse reaction to the vaccine, or it may be caused by their own disease, need to consult a doctor in time. Itching after vaccination may be caused by adverse reactions to the vaccine. Some people are allergic to the components of the vaccine, can appear similar allergic manifestations, but the general degree of mild, usually 2-3 days can be self-healing, such as the symptoms are serious or continue to aggravate the need for timely medical treatment. However, it is not excluded that the disease is caused by itself, such as allergic skin disease, scabies and so on. For example, mite allergy can stimulate the skin of the body to appear similar manifestations; scabies can cause the whole body skin redness, swelling, itching and other manifestations. Therefore, it can not be clearly diagnosed through the symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for examination and treatment.