How much does a 3-year-old child have to go to the hospital?

Generally speaking, in the case of high fever above 39 degrees, you should go to the hospital in time for treatment. Below 38.5 degrees, you can choose physical cooling. Above 38.5 degrees, you can take medicine to cool down. If there is no obvious improvement within 30-60 minutes after taking the medicine, you can take it again. If there is still no effect, you can go to the hospital for treatment.