Just coughing without fever without other symptoms is not necessarily pneumonia, you need to go to the respiratory can further clarify the diagnosis. Pneumonia is an inflammation of the terminal airways, alveoli and interstitial lung, and can be caused by pathogenic microorganisms such as bacteria, viruses, fungi, parasites, and physicochemical factors such as radiation and inhaled foreign bodies. The main clinical symptoms are fever, cough, sputum and blood in sputum, which may be accompanied by chest pain or dyspnea. The diagnosis can be clarified by blood routine, and chest X-ray or CT examination.