A body temperature over 37.5 degrees is considered a fever, and 37.5 to 38 degrees is considered a low fever. A low fever is also considered a fever, which means that the child has a fever. Common causes of fever are infections, non-infections and some other potential causes. A child has a low fever, which means that the child has a fever, but the temperature is below 38 degrees. First of all, blood tests should be performed to see if the child has any bacterial or viral infections, as well as to check for foci of infection, such as redness and swelling of the throat and other symptoms of respiratory disease. Children with persistent low fever should be on high alert for diseases such as rheumatism, tuberculosis, chronic inflammation, and immune deficiency. Examples include juvenile rheumatoid arthritis within autoimmune diseases, inflammatory bowel disease, cancers such as leukemia, lymphoma, chronic infections such as osteomyelitis, urinary tract infections, hereditary periodic fevers, etc. For children who have been on antibiotics, but always have a low fever, they should also be highly alert for antibiotic-induced drug fever, which naturally subsides after stopping the antibiotics. When a child has a low fever, first of all, we should actively conduct a physical examination of the child to clarify the cause of the low fever. For children with low fever, it is generally not necessary to use antipyretic drugs to avoid the drugs from covering up the child’s condition, thus affecting the judgment of the disease, and for children with long-term low fever, they need to be alert to special infections or autoimmune and other diseases.