Children’s allergies are mainly manifested in the circulatory system, respiratory system, skin and mucous membranes, digestive system, etc., and there are differences in the symptoms in different parts of the body, which are analyzed as follows: 1. Circulatory system: the circulatory system of children’s allergies is mainly manifested in pale face, cold hands and feet, weakness and so on. 2. Respiratory system: at this time, parents can observe that children have difficulty breathing, rapid heart rate, sneezing, runny nose and other adverse symptoms. 3. Skin and mucous membranes: children’s allergies skin and mucous membrane symptoms are more obvious, may appear eczema, hives, itching and other phenomena. 4. Digestive system: adverse symptoms of the digestive system are mainly manifested in nausea, vomiting, bloody stools, abdominal pain and so on. Children’s allergies may also have other aspects of the performance, it is recommended to go to the hospital in time to carry out relevant examinations, to clarify the cause of the disease and then actively treat the symptoms.