Daytime no cough at night cough to be vigilant cough variant asthma, reflux esophagitis, cardiac insufficiency. 1. Cough variant asthma: due to allergies and other reasons, and the etiological mechanism of bronchial asthma is the same, because the vagus nerve excitation at night, resulting in spasmodic constriction of the airways, so the cough during the day is light or not coughing, and at night heavy. 2. Reflux esophagitis: when lying down at night, the lower esophageal sphincter relaxes, causing food reflux, and the refluxed material irritates the pharynx, so there is a coughing performance, and generally do not cough during the day. 3. cardiac insufficiency: many older people, especially patients with hypertension, coronary heart disease, in the prone position, back to the heart blood volume increased significantly, there will be pulmonary stasis, coughing symptoms, standing or sitting during the daytime when the general symptoms are reduced or no coughing symptoms. Daytime no cough night cough may also have other diseases, such as allergic cough, etc. It is recommended to consult a doctor in time for relevant examinations to clarify the diagnosis. When medication is needed, it should be administered under the guidance of a doctor.