There are many diseases that cause fever and regurgitation, such as digestive system diseases, respiratory system diseases, central nervous system diseases, etc. 1, digestive system diseases: most of them are caused by bacterial infections, such as cholecystitis, acute gastroenteritis, acute appendicitis, Crohn’s disease, intestinal tuberculosis, hepatitis, primary peritonitis, etc., which may cause fever and regurgitation; 2, respiratory system diseases: upper respiratory tract infections, Respiratory diseases: upper respiratory tract infections, influenza, pneumonia, etc., can lead to fever; at the same time, in the presence of phlegm, coughing, violent cough, often make the patient regurgitation performance; 3, central nervous system diseases: such as meningitis, encephalitis, brain abscess, intracranial occupational lesions, etc., can also make the patient in the fever accompanied by headache, nausea, vomiting symptoms. When the symptoms of fever and regurgitation appear, it is recommended to go to the hospital in time for the relevant examinations such as ultrasound of the digestive system, CT of the lungs, MRI of the brain, etc., to clarify the cause of the disease, so as to make it easier for the doctor to choose the appropriate medication according to the results.