Pneumonia has more causes, which can be caused by respiratory pathogen infection, physical and chemical factors, allergies and so on.
1. Pathogen infection: after respiratory tract infection, the cilia of nasal mucosa are damaged, the airway mucosa is congested and edematous, so that the defense function of the respiratory tract decreases, and the bacteria and viruses in the air can not be filtered by the defense mechanism, and they directly enter the alveoli, thus causing pneumonia, accompanied by fever, cough, and respiratory distress.
2. Physical and chemical factors: including aspiration pneumonia caused by choking and aspiration, aspiration pneumonia, radiation pneumonia caused by radioactive injury, and so on.
3. Allergy: allergic pneumonia can be induced in susceptible individuals after repeated inhalation of organic dust and antigens.
Pneumonia causes more, if the patient suspected of having pneumonia should go to the hospital as soon as possible to avoid delay.