Fever after vomiting may be caused by gastrointestinal and respiratory diseases. 1. Gastrointestinal diseases: Common gastrointestinal infections include acute bacterial gastroenteritis and rotavirus infections, which may lead to fever after vomiting. 2. Respiratory diseases: When the child suffers from respiratory diseases such as aspiration pneumonia, bronchitis, upper respiratory tract infection, etc., it may lead to fever after vomiting. In addition, encephalitis, meningitis, poisoning and other causes may also cause fever after vomiting, it is recommended that the child consult a doctor in a timely manner to determine the cause of the disease and then targeted treatment.