Dry cough during the day and no cough at night may be caused by allergic cough, chronic pharyngitis, upper respiratory tract infections and other reasons. 1. Allergic cough: If you are exposed to allergens such as dust during the day, you may experience a paroxysmal, irritating dry cough. 2. Chronic pharyngitis: If chronic pharyngitis patients consume spicy and irritating foods during the day, it can induce coughing, but if they are not exposed to the triggering factors at night, they may not cough. 3. Upper respiratory tract infection: During the day, the inflammatory stimulus causes pharyngeal mucosal congestion and edema, which can cause coughing symptoms. At night, when you sleep, the level of inflammatory response is relatively low, and the secretions produced in the airway are reduced to the intensity that causes coughing. There may be other reasons for the above symptoms. It is recommended that patients who do not experience relief for a long period of time need to go to the hospital in a timely manner to identify the cause of the disease and actively treat it.