The reason for coughing at 5 or 6 am may be related to upper respiratory tract infections, lower respiratory tract infections, lung abscesses, bronchiectasis and other lung diseases. 1. Upper respiratory tract infections: such as pharyngitis, tonsillitis, etc., 5 or 6 a.m. may be coughing, coughing up phlegm, night accumulation of respiratory secretions will be coughed up early in the morning. 2. Lower respiratory tract infections: such as bronchitis, bronchitis, pneumonia, etc., also cough in the morning, cough sputum, white mucous sputum is common, combined with the infection may have pus sputum. 3. Lung abscess: characterized by coughing and coughing up a lot of purulent sputum, the mucous membrane of the respiratory tract secretes a lot of mucus, which is reflexively coughed up in the morning. 4. Bronchiectasis:characterized by coughing, coughing up yellow sputum, coughing up blood, and coughing at 5 or 6 in the morning to discharge sputum and clear the airways. 5. Other: such as bronchial asthma, tuberculosis, respiratory tract tumors, etc. early in the morning at five or six o’clock will also cough, bronchial asthma to cough, lung rales mainly, tuberculosis to low fever, dry cough, night sweats, coughing up blood as a characteristic, respiratory tract tumors stimulate the respiratory tract mucosa can also cause the patient five or six o’clock in the morning cough. Cough at five or six o’clock in the morning for more reasons, the patient should be timely to the regular hospital respiratory medicine, clear causes, early treatment, so as not to delay the condition.