The danger of acute bronchitis lies mainly in the damage to the lumen of the bronchial tubes and the effect it has on respiratory function. Acute inflammation of the bronchial tubes may cause a decrease in immune function. 1. Bronchial injury: acute bronchitis refers to the acute inflammation of the bronchial area, which will directly cause different degrees of damage to the bronchial mucosa, inflammation and edema, resulting in repeated coughing and coughing up sputum. 2. Respiratory disorders: acute bronchitis will cause mucosal edema or local lumen narrowing, thus affecting the normal respiratory and inspiratory functions, which will make the patient experience different degrees of respiratory disorders or dyspnea and other symptoms. 3. Decreased immunity: most of the acute bronchitis is caused by viral infection, so after viral infection and invasion of the body, it will cause different degrees of immune function damage and decreased immunity. After acute bronchitis, it is recommended to go to the hospital as soon as possible for anti-inflammatory treatment, and by adjusting the diet to protect the bronchial mucosa, can help recovery.