There are two main types of bronchial mucosal lesions, including infection-induced bronchial mucosal lesions and bronchial mucosal lesions caused by non-infectious factors. 1. Infection-induced bronchial mucosal lesions: such as bronchial mucosal infection by bacteria, viruses, mycoplasma and chlamydia and bronchial inflammatory changes, usually manifested as bronchial mucosal congestion and edema, including acute bronchitis and chronic bronchitis. Infection by specific pathogens, such as Mycobacterium tuberculosis, can also lead to endobronchial tuberculosis. Acute bronchitis is usually characterized by an acute onset of symptoms such as fever, cough and sputum. Chronic bronchitis is usually characterized by chronic coughing, sputum, and wheezing. Endobronchial tuberculosis can be characterized by an irritating dry cough that is difficult to control. 2. Bronchial mucosal lesions caused by non-infectious factors: for example, bronchopulmonary cancer, usually manifested by the growth of new organisms on the bronchial mucosa, which is mainly manifested by coughing, coughing up sputum and hemoptysis. If the bronchial mucosal lesions occur, you should consult a doctor in time, improve the examination, clarify the cause of the disease, and standardize the treatment under the doctor’s guidance, so as to avoid delaying the condition.