The causes of fever and red eyes in children are as follows: 1. Consider children with pharyngeal conjunctival fever, pharyngeal conjunctival fever is caused by adenovirus type 3 and 7 infections, characterized by fever, pharyngitis, conjunctivitis, starting relatively quickly, characterized by high fever symptoms, pain in the throat, redness on one side of the eye, or both sides but reduced eye discharge, sometimes accompanied by nausea, vomiting, abdominal pain or diarrhea symptoms. 2. Consider allergies In addition to fever and infrared eyes, the symptoms include sneezing, runny nose, nasal congestion, photophobia, and watery eyes. 3. Consider that the child has pediatric conjunctivitis, because the child usually does not pay attention to eye hygiene, rubbing the eyes with dirty hands, the conjunctiva is infected by bacteria or viruses, showing symptoms such as conjunctival congestion, itching, and increased secretions. The child may have symptoms such as increased secretions.