Right middle lobe bronchial stenosis is a narrowing of the lumen of the right middle lobe bronchus, which can cause symptoms such as dyspnea. Causes of right middle lobe bronchial stenosis include bronchial foreign bodies, bronchial tumors, bronchospasm, and compression by tumors outside the airway. When the bronchial lumen is narrowed, the airway can be obstructed and ventilation can be blocked, causing pulmonary tissue expiratory and ventilatory dysfunction, causing symptoms such as shortness of breath and dyspnea. When bronchial stenosis occurs, secretions in the lung tissue cannot be discharged effectively, which may also cause obstructive pneumonia and aggravate dyspnea. When right middle bronchial stenosis occurs, it is recommended to consult a doctor in time, improve chest CT and other examinations to clarify the cause of the disease and diagnosis, and carry out treatment in a standardized manner under the guidance of a professional doctor.