Bronchitis is a chronic nonspecific inflammation of the trachea, bronchial mucosa and surrounding tissues. The main cause of bronchitis is the formation of chronic non-specific inflammation of the bronchi due to recurrent infection by viruses and bacteria. When the temperature drops, small blood vessels in the respiratory tract spasm ischemia, defense function decreases, etc. conducive to disease; smoke dust, pollution atmosphere and other chronic stimulation can also develop; smoking makes bronchospasm, mucosal degeneration, cilia movement is reduced, mucus secretion increases favorable infection; allergic factors also have a relationship. A variety of acute infectious diseases such as tuberculosis, lung abscess, mycoplasma pneumonia, measles, pertussis, acute tonsillitis, etc., as well as postnasal drip syndrome, cough variant asthma, gastroesophageal reflux disease, interstitial lung disease, acute pulmonary embolism and lung cancer often have a cough at the onset, similar to the cough symptoms of acute bronchitis, so they should be examined in depth and clinically need to be differentiated in detail. The symptoms of influenza are quite similar to those of acute bronchitis, but it is not difficult to differentiate from the widespread epidemic of influenza, the acute onset of the disease, the obvious signs of systemic toxicity, high fever and generalized muscle pain, etc. The virus isolation and complement binding test can confirm the diagnosis. 1, patients with systemic symptoms should pay attention to rest and warmth The purpose of treatment is to reduce symptoms and improve the function of the body. Patients often need to supplement fluids and apply antipyretic drugs. Appropriate cough suppressants can be applied. Expectorants can be applied when the sputum volume is high or sticky. 2. Patients with acute bronchitis do not have significant therapeutic effect on antibacterial drugs. Abuse of antibacterial drugs should be avoided in the treatment of patients with acute bronchitis. However, if the patient has fever, purulent sputum and severe cough, it is an indication for the application of antibacterial drugs. The application of antibacterial drugs for the treatment of patients with acute bronchitis can be applied against Chlamydia pneumoniae and Mycoplasma pneumoniae, such as erythromycin, but also clarithromycin or azithromycin. During influenza epidemic, anti-influenza treatment measures should be applied if there are manifestations of acute bronchitis. 3, chronic bronchitis acute exacerbation treatment (1) control of infection: depending on the main causative agent of infection and the severity or according to the results of the pathogenic bacteria drug sensitivity selection of antibacterial drugs. If the patient has purulent sputum, it is an indication for the application of antibacterial drugs. Mild cases can be taken orally, more serious patients with intramuscular or intravenous injection of antibacterial drugs. Commonly used are penicillin G, erythromycin, aminoglycosides, quinolones, cephalosporins and other antibacterial drugs. (2) Expectorant and cough suppressant: In patients with acute exacerbation, expectorants and cough suppressants are applied in parallel with anti-infection treatment to improve symptoms. Commonly used drugs include ammonium chloride combination, bromhexine, aminoglutethimide, carboxymethylcysteine and potent diluted mucin. Chinese herbal medicines can also have certain effect in relieving cough. For elderly people who are weak and unable to cough up sputum or those who have more sputum, they should assist in sputum discharge and clear the airway. The application of cough suppressants should be avoided to avoid inhibiting the center and aggravating the obstruction of the respiratory tract and generating complications. (3) Antispasmodic and wheezing: drugs are often used such as aminophylline and terbutaline orally, or short-acting bronchodilators such as salbutamol by inhalation. If airflow restriction persists, pulmonary function tests are required. If the diagnosis of chronic obstructive pulmonary disease is clear, use long-acting bronchodilator inhalation, or glucocorticoid plus long-acting bronchodilator inhalation if necessary. (4) Nebulizer therapy: Nebulizer inhalation can dilute the secretions in the trachea and facilitate sputum excretion. If the sputum is sticky and not easy to cough up, nebulized inhalation can help to a certain extent. 4, chronic bronchitis stable treatment Pay attention to the prevention and treatment of colds: colds can make patients in remission relapse of old diseases. In a longer period of time (at least 1 year), it is important to have regular preventive treatment for colds, such as flu vaccine, or herbal medicine to prevent colds.