Pediatric pneumonia mainly refers to pathogenic infections including bacteria, viruses, mycoplasma, chlamydia, and fungi, as well as hypersensitivity reactions that cause parenchymal and interstitial lung lesions. The main clinical manifestations are fever, coughing and sputum, chest pain, shortness of breath, dyspnea, etc. In severe cases, it can be complicated by myocarditis. In the early stage of infection, some symptoms of upper respiratory tract infection may appear, including nasal congestion and runny nose, cough and sore throat. In addition, as the disease progresses, lung auscultation signs become apparent and wet rales may appear. If the disease is not treated promptly, cardiovascular diseases such as myocarditis may be complicated; if the high fever is not corrected by proper treatment, it may cause neurological symptoms such as febrile convulsions. In conclusion, if the symptoms of upper respiratory tract infection or cough and fever persist for more than a week, then pulmonary infection should be considered and it is recommended to go to the hospital for relevant tests, including blood tests, chest X-ray and pathogenic tests, to clarify the cause and treat the symptoms to prevent complications of other systemic diseases.