Bronchitis changes are histomorphologic changes that occur in the bronchial tubes and their surrounding mucosa and tissues as a result of inflammatory damage, and are generally less serious. When the bronchial tube is infected, the bronchial mucosa and its surrounding tissues will gather a large number of immune cells, release inflammatory substances, and an inflammatory reaction occurs, and the bronchial mucosa and the surrounding tissue cells will be damaged as a result of this damage, and inflammatory changes will occur, which are manifested as congestion, redness, and swelling of the mucosa. Bronchitis changes are generally reversible, after active treatment, bronchitis can be cured, and bronchitis changes will gradually return to normal. Chronic bronchitis has a high possibility of recurrence, but it is generally not life-threatening, and it will not affect the natural life expectancy after active treatment, and it will not be cancerous, so it is generally not too serious.