Coughing for more than a month may have some effect on the lungs, and it should be noted that coughing for more than a month may have underlying lung pathology, which may aggravate the condition if not actively treated. Cough is a defensive phenomenon of the respiratory tract, a slight cough is beneficial to the lungs, is conducive to help the lungs discharge some secretions. However, prolonged excessive coughing may result in rupture of the bronchial mucosa, hemoptysis, etc. If inhaled into the lungs, lung infection may occur. At the same time, coughing for more than a month, generally consider the existence of respiratory system pathology, if the early for the upper respiratory tract infection, not actively treated, may also be extended to the lungs, lung infection; may also be early on the existence of lung lesions, if not actively treated, may also make the disease further aggravation. It is recommended that if the cough does not improve for more than a month, you should go to the hospital in time for routine blood tests and chest radiographs to determine the cause of the disease, and then take active treatment.