Children with diarrhea, fever, cough, are bacterial and viral invasion caused by upper respiratory tract infection symptoms caused by fever, aggravation of the condition caused by pneumonia, the formation of cough symptoms, if the irritation of the mesenteric lymph nodes, caused by inflammation of the mesenteric lymph nodes will result in the phenomenon of diarrhea. You can check the blood routine, blood sedimentation, C-reactive protein, chest X-ray and abdominal ultrasound. According to the blood and image analysis, if the fever and cough are caused by viral infection, antiviral drugs can be used to treat the symptoms. If the fever, cough and diarrhea are caused by bacterial infection, antibiotic drugs such as penicillin, cephalosporin and macrolides can be used for symptomatic treatment. Children with fever need to drink more water, pay attention to rest, supplement vitamin C, to prevent dehydration.