The causes of recurrent fever in two-year-old children include the following: 1. Children who belong to the immunodeficiency type. If a child has an immunodeficiency disease that causes recurrent bacterial infections as well as viral infections, it can cause recurrent fever in children, which needs to be relieved by timely application of drugs such as gammaglobulin. 2. Caused by children with medications that are not appropriate. If a child’s fever belongs to an uncommon pathogen or an immune disease, it is difficult to achieve good results by applying conventional drugs, which can cause recurrent fever. If the fever is caused by rheumatoid arthritis, children need to apply non-steroidal anti-inflammatory drugs and glucocorticoids in a timely manner.