Early signs of encephalitis in children clinically usually include headache, fever, vomiting, and poor mental health. Patients with early encephalitis have different symptoms due to their constitution and age. At first, symptoms such as fever, headache, nausea and vomiting may occur. Patients with encephalitis may also experience neurological symptoms such as poor mental acuity, confusion, convulsions, and irritability. Severe vomiting may also lead to dehydration, poor diet, and bowel and bladder abnormalities. The diagnosis of early encephalitis can be confirmed by symptoms, signs, electroencephalogram, cerebrospinal fluid routine and culture, and brain biochemistry. The above symptoms are not specific and can also be seen in other diseases, such as respiratory infections, so children who are suspected of having encephalitis need to seek prompt medical attention.