Coughing at 3:00 a.m. has the following conditions: First, the presence of tuberculosis, tuberculosis is mostly coughing at night and in the early hours of the morning, you need to give a chest X-ray or chest CT for further investigation. Coughing at three in the morning, if there are hot flashes, night sweats, blood in the sputum, most consider tuberculosis caused by. Secondly, if the cough at three in the morning is relatively short, accompanied by allergic rhinitis, allergic pharyngolaryngitis, as well as smoking, odor sensitivity, the cough should be highly suspected of belonging to the bronchial allergic cough, do not rule out cough variant asthma. Third, lung infection diseases, such as bronchitis, pneumonia, chronic obstructive pulmonary disease, coughing is often aggravated at night, especially from three to five in the morning. Because traditional Chinese medicine believes that this hour belongs to the c time, dominated by the lung meridian, the lung qi is easy to pronounce, stimulate the respiratory tract and lead to coughing. Coughing at 3 a.m. belongs to the time cough, which requires specific treatment according to the specific disease.