What are the main causes of bronchitis?

The main causes of bronchitis are as follows:

What are the main causes of bronchitis?

1. Infection: It can be directly infected by viruses or bacteria, or it can be caused by the spread of viruses or bacteria in acute upper respiratory tract infections. Common pathogenic bacteria are Haemophilus influenzae, pneumococcus, streptococcus, staphylococcus and the like. Nocardia infection has increased. Bacterial infections are often secondary to viral infections and occur when the body's tracheal-bronchial function is impaired.

2. Physical and chemical factors: Inhalation of cold air, dust, irritating gases or smoke (such as carbon dioxide, nitrogen dioxide, ammonia, chlorine, etc.) may also cause acute stimulation of the tracheal-bronchial mucosa.

3. Allergic reactions: common pathogens include pollen, organic dust, fungal spores, etc.; hookworms, aphids larvae in the lungs; or allergic to bacterial proteins, causing tracheal-bronchial allergic inflammation, may also Lead to the disease. Trachea, bronchial mucosa congestion, edema, ciliated cell damage, hypertrophy of mucosal glands, increased secretions, and lymphocyte and neutrophil infiltration. If the bacteria are infected, the secretions may be mucopurulent. The structure and function of the mucosa can return to normal after the inflammation subsides.


4. Intrinsic factors: the respiratory function is reduced, that is, the regulation of the temperature and humidity of the inhaled air; the adhesion of the bronchial mucosa to the inhaled foreign body; the defense effect of the bronchial secretion and the mucus ciliary movement system is destroyed and cannot work normally.