In clinical practice, families of children often ask doctors what kind of pneumonia my baby has. In order for families to understand what kind of pneumonia they have, they need to know how pneumonia is classified. Pneumonia is divided into 6 categories according to different methods: 1. pathological classification: lobar pneumonia, bronchopneumonia, interstitial pneumonia 2. etiological classification: viral pneumonia, bacterial pneumonia, mycoplasma pneumonia, chlamydial pneumonia, protozoal pneumonia, fungal pneumonia, pneumonia caused by non-infectious etiologies (such as aspiration pneumonia, fallout pneumonia, allergic pneumonia, etc.) 3. course of disease classification: acute pneumonia (duration <1 month), prolonged pneumonia 4, disease classification: mild (in addition to the respiratory system, other systems only slightly involved, no systemic toxicity symptoms), severe (in addition to respiratory failure, other systems involved, can be life-threatening) 5, clinical manifestations typical or not classification: typical pneumonia, atypical pneumonia 6, pneumonia location classification: community-acquired Pneumonia, hospital-acquired pneumonia As an example, a 5-year-old child with fever and cough after a cold at home, a film was taken and found to have a large area of pneumonia involving one lobe of the lung, and the blood was checked positive for mycoplasma, the child could be diagnosed with pneumonia, which, according to the above classification, could be classified as: lobar pneumonia, mycoplasma pneumonia, acute pneumonia, atypical pneumonia, community-acquired pneumonia.