Fever and diarrhea may be due to acute gastroenteritis and inflammatory bowel disease. 1.Acute gastroenteritis: (1) Bacterial infection: Bacterial infection can trigger acute gastroenteritis, leading to abdominal pain, diarrhea and other symptoms. Pathogenic bacteria, if they enter the bloodstream through the broken intestinal mucosa, can also cause patients to develop fever. (2) Viral infections: viral infections, such as Coxsackie virus, rotavirus, etc., may also lead to gastrointestinal colds, unformed stools, watery stools, etc., resulting in diarrhea and fever symptoms. 2. Inflammatory bowel disease: Crohn’s disease, ulcerative colitis and other diseases can also lead to diarrhea and fever, accompanied by mucus, pus and blood stools. Fever, diarrhea may also be related to other causes, it is recommended to go to the hospital in a timely manner, under the guidance of a professional physician to clarify the cause of the disease, and give targeted treatment or therapy.