Children with fever at night and no fever during the day may be due to measles, acute pharyngitis, acute otitis media and other diseases. 1. Measles: usually caused by measles virus infection, is a highly infectious disease, can be transmitted through droplets. Patients often have fever, cough and other symptoms similar to the common cold, which can also be manifested as children with fever at night and no fever during the day. Some patients can also be accompanied by conjunctival congestion, tearing, skin rash and other phenomena. 2. Acute pharyngitis: usually due to viral infections, bacterial infections and other conditions, and also with the environment, living habits, body immunity and other factors. Patients often appear dry and itchy eyes, sore throat and other symptoms, and can also be accompanied by chills, fever, flushing and other phenomena, some patients may also appear in children with fever at night and no fever during the day. 3. Acute otitis media: usually caused by acute bacterial infection, and also related to low immune function, breastfeeding position and other factors. Patients often appear ear pain, tinnitus, hearing loss and other symptoms, some patients can also be accompanied by fever, diarrhea, cold and other phenomena, so patients can also appear children’s fever at night during the day phenomenon. It is recommended that children with fever at night and no fever during the day should seek medical attention in a timely manner to find out the cause of the disease under the guidance of the doctor and carry out reasonable treatment.