The most common cause of pneumonia is infection, such as bacteria, viruses, fungi, parasites and other infections, but also physical and chemical environment and other factors.
1. Bacterial pneumonia: it is the most common pneumonia, and the pathogenic bacteria are: aerobic gram-positive cocci, common Streptococcus pneumoniae, Streptococcus aureus, Streptococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa and other aerobic gram-negative bacilli; anaerobic bacilli such as Streptococcus, Clostridium and other bacilli.
2. Pneumonia caused by Mycoplasma, Legionella and Chlamydia.
3. Viral pneumonia: caused by coronavirus, respiratory virus, influenza virus and so on.
4. Fungal infectious pneumonia: caused by Candida albicans, Aspergillus, Actinomyces and so on.
5. Pneumonia caused by other pathogens: Rickettsia, Toxoplasma gondii, protozoa (e.g. Pneumocystis carinii), parasites (e.g. Pneumocystis carinii, Schistosoma pneumoniae) and so on.
6. Pneumonia caused by physical and chemical environmental factors: radioactive damage, stomach acid, inhalation of irritating gases, liquids and other chemical substances can lead to pneumonia.
Pneumonia patients are recommended to consult a doctor in time and be treated actively under the guidance of a physician.