If your child has recurrent fever within a month, it is often serious and you need to take your child to the hospital for a clear examination to identify the cause of the fever for targeted treatment, especially to exclude recurrent fever caused by hematologic diseases or malignant tumors. If there is nasopharyngeal discomfort, the child should have an MRI of the nasopharynx. If head discomfort occurs, such as headache or dizziness, MRI of the head should be done. If coughing or coughing up sputum occurs, a CT examination of the chest is needed. In addition, blood tests, C-reactive protein, and antibodies to Mycoplasma pneumoniae should be performed, and recurrent fever within a month due to chronic infection should not be excluded. In case of chronic infections, respiratory infections are the most common, and gastrointestinal infections may occur. When a urinary tract infection occurs, there will be frequent, urgent, and painful urination. In the case of digestive infections, they are often accompanied by chronic diarrhea.