Coughing during the day and not coughing at night may be irritant cough or allergic cough, usually due to the presence of irritating substances or allergic factors in the environment where the patient works or studies during the day. 1. Irritant cough: refers to the mucous membrane of the pharynx and trachea is subjected to physical and chemical stimuli, such as smoke, dust or irritating gases, and caused by reflex cough, usually manifested as a dry cough. Irritant cough is a manifestation of the body’s self-protection. Coughing during the day and not coughing at night may be caused by the patient in the daytime easy to cause irritating cough environment, and at night away from the environment symptoms can be relieved. 2. Allergic cough: Coughs that occur when people with allergies are triggered by allergic factors, which usually include pollen, fumes, dust, cold air, irritating gases, and so on. Coughing during the day and not coughing at night may be due to the presence of allergens in the patient’s environment during the day, while at night to avoid the allergic factors, coughing symptoms can be relieved or disappear. Patients with daytime cough and nighttime cough, it is recommended to go to the hospital in time to find out the cause.