What causes bronchial stenosis?

Bronchial stenosis is associated with endobronchial lesions, such as endobronchial foreign bodies, granulomas, tumors, etc.; surrounding space-occupying lesions can also cause bronchial stenosis, such as thyroid abscess, thyroid hematoma, thyroid cancer, esophageal cancer, etc.; bronchial stenosis is also common after tracheotomy.