Interstitial pneumonia, also known as diffuse pulmonary interstitial fibrosis, mainly refers to a disease characterized by the replacement of the lung interstitium with some invisible fibrous tissues, leading to lung atrophy and difficulty breathing as the main manifestations. The pathological site of pneumonia is mainly in the alveoli and lung parenchyma, and patients mainly show symptoms such as coughing, expectoration, and fever, generally not experiencing difficulty breathing. Additionally, interstitial pneumonia and pneumonia have typical and distinct changes in imaging. Through imaging, it is basically possible to differentiate almost completely between interstitial pneumonia and pneumonia without the need for any special techniques.