The baby suddenly had a fever and no other symptoms.

If your baby suddenly shows a fever, but no other symptoms, such as nasal congestion, runny nose, sore throat, or clinical symptoms of abdominal pain, diarrhea, bloating. It is most likely caused by viral infection. If the temperature increase is not particularly obvious, pay attention to drink plenty of water and observe it. However, if the body temperature exceeds 38.5 degrees, it is necessary to actively apply physical cooling methods or take antipyretic drugs at the same time for treatment. If the fever persists, it is necessary to go to the pediatrics department of the hospital in time to determine whether it is caused by viral infection. If it is determined that it is caused by viral infection, it is necessary to apply some antiviral drugs in time for treatment, which can effectively alleviate this symptom.