The specific causes of fever and nausea in children are as follows: First, when gastrointestinal indigestion is caused by eating too much food, nausea, vomiting and fever will occur. Secondly, when acute gastrointestinal inflammation is caused by unclean food, fever and nausea will also occur. Third, fever and nausea can also occur when children develop gastrointestinal flu. Fourth, children due to viral or bacterial infection and other pathogens, the formation of encephalitis, there will also be fever and said nausea phenomenon occurs. Fifth, when a child develops a common surgical system such as appendicitis, he or she will also have fever and nausea. When the child has a fever, nausea, according to its accompanying symptoms in the doctor’s detailed examination, according to the actual situation to give targeted treatment.