There are many reasons for the sound in the airway while breathing, and the common causes are bacterial infection, viral infection, asthma, foreign body, etc. 1. Bacterial infection: Bacterial infection causes obvious exudation in the airway and wheezing sound when breathing, which is commonly seen in bacterial pneumonia and so on. 2. Viral infections: viral infections cause severe damage to lung tissue and bronchial mucosa, which can locally secrete excessive phlegm, causing wheezing sounds when airflow is obstructed during human respiration. 3. Asthma: airway spasm and narrowing caused by various allergens stimulating the respiratory tract, resulting in sound when the patient breathes. 4. Foreign bodies: foreign bodies cause narrowing of the airways, causing a sound in the airway when breathing. There are other factors, such as chronic bronchitis, emphysema, chronic pulmonary heart disease, acute and chronic rhinitis, etc., you should go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of a professional physician, follow the doctor’s instructions for targeted treatment, and do not take medication on their own, so as not to delay the condition.