Children with low fever need to be alert to respiratory system infections, digestive system infections, endocrine system diseases. Respiratory infections: common diseases that cause low fever are tuberculosis, pharyngitis, pneumonia, tonsillitis, bronchitis, viral colds, etc., which can be accompanied by coughing, runny nose, sore throat, fatigue, night sweats and other symptoms. Digestive system infections: common diseases include intestinal tuberculosis, ulcerative colitis, gastritis, Crohn’s disease of the small intestine, typhoid fever, paratyphoid fever, etc., which can also make the child show symptoms of low fever. Mostly nausea, vomiting, diarrhea and other symptoms. Endocrine system diseases: common diseases that cause low fever are hyperthyroidism. There can be fear of heat, excessive sweating, hand tremor and other symptoms. Children with low-grade fever need to consult a doctor in a timely manner, be evaluated by a specialist and complete the relevant examinations, such as chest X-ray, blood tests, thyroid function tests, etc., to identify the cause of the disease, and follow the doctor’s instructions to carry out targeted treatment.