Vomiting and fever are common clinical symptoms that can occur in people of any age, but the causes of vomiting and fever are complex. Vomiting and fever are usually caused by gastrointestinal diseases, such as acute gastroenteritis, which can cause vomiting and diarrhea accompanied by an increase in body temperature, and should be promptly seen by a hospital to prevent dehydration. Secondly, there may be vomiting and fever caused by gastrointestinal colds caused by cold, which may also be accompanied by headache, dizziness, loss of appetite and other symptoms. For specific medication and dosage, you should go to the hospital for a face-to-face consultation and use the medication under the guidance of a doctor. In the case of children with fever and acute episodes of vomiting and diarrhea, it is usually a gastrointestinal disease caused by infection, and the pathogens can vary with the season, for example, autumn diarrhea often occurs in autumn and is generally associated with rotavirus infection; fever, vomiting and diarrhea that occur in summer should be considered dysentery bacillus and Escherichia coli infection. Other systemic diseases, such as respiratory tract infections often present with fever, cough and sputum, which can also be accompanied by vomiting or and diarrhea. Finally, it is important to note that if headache and fever with jet vomiting occur, brain lesions, such as the common meningitis, should be considered, and this condition should be taken seriously and a timely visit to the hospital should be made to identify the cause. In conclusion, the cause of vomiting and fever can be big or small, and attention should be paid to the identification and treatment. Especially in children, if fever is accompanied by nausea and vomiting, it should be taken seriously.