The presence of cough alone does not necessarily indicate pneumonia, as many other diseases of the respiratory system can also appear to have coughing symptoms, such as cold, flu, acute upper respiratory tract infection, acute bronchitis, chronic bronchitis, bronchiectasis, tuberculosis, and pulmonary malignancy. Cough is one of the very common clinical symptoms. To determine whether pneumonia is present, a CT examination of the lungs can be perfected, and blood tests for routine C-reactive protein can be drawn at the same time. If the CT indicates imaging changes of pneumonia, such as a solid shadow or exudate shadow, pneumonia should be considered. If the blood picture is elevated and the C-reactive protein is elevated, it can further indicate bacterial pneumonia, and once pneumonia is diagnosed, anti-infective treatment should be actively administered.