Dry cough during the day and no cough at night may be caused by allergic cough, pneumonia and chronic pharyngitis. 1. Allergic cough: When the patient has an allergic cough, because of easy contact with allergens such as dust and pollen during the day, it is easy to cause the patient to cough, which causes the patient to have a dry cough during the day and no cough at night. 2. Pneumonia: If the patient has pneumonia, the work pressure in life is too big, which can easily cause the lungs to be overburdened, and can also cause the patient to have a dry cough during the day and no cough at night. 3. Chronic pharyngitis: when patients have chronic pharyngitis, due to their own disease factors or patients usually need to speak too much, may cause cough phenomenon. It should be noted that if the patient has a dry cough during the day and no cough at night, he should go to the hospital in time to find out the cause of the disease and actively treat it so as not to delay the condition.