Children’s diarrhea after fever may be caused by gastroenteritis, respiratory tract infection, bacterial dysentery and other reasons. 1. Gastroenteritis: children’s own intestinal problems, gastroenteritis after being infected by bacteria or viruses, severe inflammation will cause fever, inflammation constantly stimulate the gastrointestinal mucosa, fever will have diarrhea after the performance. 2. Respiratory infections: children with respiratory infections, bacterial and viral infections can cause fever, may also disrupt the function of the gastrointestinal tract, fever with diarrhea after the performance. 3. Bacterial dysentery: children have unclean diet, eating food contaminated by bacteria, may cause dysentery bacillus invasion, through the digestive tract infection of the human body, colon mucosa triggered by inflammation, ulceration, and release of toxins into the bloodstream, there will be fever, diarrhea symptoms. Children have more causes of diarrhea after fever, serious cases are recommended to seek timely medical treatment.