Thickening of the bronchial wall may be caused by chronic bronchitis, bronchial asthma, endobronchial tumors and other factors. 1. Chronic bronchitis: chronic non-specific inflammation of the trachea, bronchial mucosa and its surrounding tissues can lead to fracture and atrophy of the smooth muscle bundles in the submucosal layer, submucosal and peribronchial fibrous tissue proliferation, and the injury-repair process of the bronchial wall occurs repeatedly, which in turn causes remodeling of the bronchial structure, increase in the collagen content, and scar formation. 2. Bronchial asthma: due to the repeated occurrence of airway inflammation, injury and repair in patients with bronchial asthma, airway remodeling, smooth muscle hyperplasia, glandular hypertrophy, and ultimately bronchial wall thickening. 3. Endobronchial tumor: if the patient suffers from endobronchial tumor, then in the process of early tumor cell development and infiltration, it may also lead to bronchial wall thickening. Bronchial wall thickening can also be caused by other reasons, if the patient has bronchial wall thickening, it is recommended that the patient go to the hospital in time to improve the examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment.