How is bronchitis caused?

Wichitis is divided into acute bronchitis and chronic bronchitis. Acute bronchitis is caused by biochemical stimuli or allergies. Acute bronchitis inflammation caused by factors is mostly sporadic, with no epidemic tendency, and the elderly, the weak, the sick and the disabled are susceptible. The main symptoms are cough and expectoration, which often occur in cold season or climate change, and can also be caused by acute upper respiratory tract infection.

The main reason is microbial infection, and some are physical and chemical stimuli, such as acute injuries caused by inhaling cold air, dust and irritating gases. Allergic reaction: The human body is allergic to inhaled allergens or protein, which will cause bronchial inflammation.

Chronic bronchitis is a chronic nonspecific inflammation of tracheobronchial mucosa and its surrounding tissues. Clinically, cough, expectoration and wheezing are the main symptoms, which last for three months or longer every year and last for two years or longer. Other diseases can be diagnosed as chronic bronchitis if cough, expectoration and wheezing are excluded.

The main reasons are smoking, occupational dust or exposure to chemicals and air pollution. In addition, repeated infection is also one of the important reasons for the occurrence and development of chronic bronchitis. Other factors including immune disorder, airway hyperresponsiveness dysfunction, aging, climate and environmental factors are also related to the occurrence and development of chronic bronchitis.