How should a 5-year-old child with a sudden fever at night be treated?

Patient's question:

Last night at 21:30, I noticed my child was flushed and measured 39.2 degrees Celsius with a thermometer, with warm hands and feet. During the day, the child was in good spirits and had a good appetite, eating normally for breakfast, lunch, and dinner, and playing happily with other children. Since the child had a history of convulsions during low-grade fever in the past, I applied a fever-reducing patch and a fever-reducing. Thirty minutes later, the temperature dropped to 38.8 degrees, and after another 40 minutes, it dropped to 38.1 degrees. Later, the child broke into a sweat, and their clothes were almost soaked. The fever subsided, and the temperature returned to normal. It has been stable ever since this morning, with no high fever. The child also slept well last night and ate breakfast this morning.
Previous Treatment and Effects:
On March 15, 2013, the child also had a high fever of 39.6 degrees at night. Due to a cold, the child had been coughing with phlegm. On March 16, a blood test revealed 20,000 white blood cells, and an X-ray showed right lower pneumonia. The child was given intravenous drips for five days and treated with medication.
Kind of Help Needed:
This time, I really don’t know what caused it. The child is doing well, but should I take them to the hospital for a check-up?

Doctor's answer:

The most common cause of a child's fever is infection. The fever lasts for less than 48 hours, or symptoms such as dry cough, vomiting, and lethargy reappear. It is necessary to go to the hospital for a urine test to check for bacterial, viral, or mycoplasma infection. Based on the results of the urine test, medication should be administered according to the symptoms. The doctor should also perform a lung auscultation or take a chest X-ray to check for pneumonia. If the fever lasts for a long time, it is important to be alert to the possibility of EB virus infection. If the temperature is below 38.5 degrees, use Meilin to reduce the fever orally.

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