What is pneumonia?

Pneumonia refers to the pulmonary parenchymal infection of alveolar cavity and interstitial tissue, which can be caused by many pathogens, such as bacteria, fungi, viruses, parasites, or radiation, chemicals and allergic factors. Fluid and cells ooze from infected tissues and fill the lungs. If inflammation is confined to one lung lobe, it is called lobar pneumonia, and if inflammation spreads from one bronchus to another, it is called bronchopneumonia. If both lungs have inflammation, it is called double pneumonia, which usually lasts for about 2 weeks. In recent years, due to the wide application of antibiotics, mild or atypical pneumonia is common in clinic, but whole leaf consolidation pneumonia is rare.

Viral pneumonia is usually mild. Bacterial pneumonia is more serious.

The most common pathogen of bacterial pneumonia is pneumococcus, sometimes called pneumococcus. Haemophilus pneumonia is usually a complication of influenza, and pneumonia can also be caused by mycobacterium tuberculosis. Legionella pneumonia can be transmitted through polluted water in many ways, including bathtubs and air conditioners. Aspiration pneumonia is caused by bacteria entering the lungs through the mouth or stomach.

Etiological classification: bacterial pneumonia, viral pneumonia, mycoplasma pneumonia, rickettsia pneumonia, fungal pneumonia and pneumonia caused by other pathogens.

Anatomical classification: lobar (alveolar) pneumonia, lobular (bronchial) pneumonia and interstitial pneumonia.