The whistling sound in the trachea is considered to be caused by tracheal dysplasia, bronchial asthma or bronchitis, bronchospasm, and foreign bodies in the trachea. 1. Tracheal dysplasia: mainly common in congenital laryngeal dysplasia. A whistling sound often occurs during exhalation, and a tracheal chirping sound can occur in severe cases. 2. Bronchial asthma or bronchitis: when suffering from bronchial asthma or bronchitis, the expiratory time will be prolonged due to the resistance to expiration, which will lead to a whistling sound in the trachea, often accompanied by dyspnea. 3. Bronchospasm: When the smooth muscle of the bronchial tube contracts or spasms due to certain reasons (respiratory tract infection, allergy), the sound of huffing and puffing in the trachea can occur. 4. Tracheal foreign body: foreign body in the trachea can cause local airway obstruction, when the gas passes through the narrow airway can appear whistling sound. When there is a whistling sound in the trachea, you need to go to the hospital in time to check the specific cause and treatment, so as not to delay the condition.