The appearance of long-term cough is not good, may be environmental factors, cough variant asthma, chronic bronchitis or chronic obstructive pulmonary disease and other causes. 1. Environmental factors: If you are engaged in long-term work such as painting and painting, due to exposure to chemical agents or irritating odors, a long-term cough does not get better. 2. Cough variant asthma: Cough variant asthma is due to some people’s airway hyperresponsiveness or allergy to some substances, which causes cough, often dry cough, mainly at night. 3. Chronic bronchitis: the onset of slow and recurrent, longer duration of the disease, the clinical manifestations of cough in the morning, cough sputum more intense, aggravated by viruses, bacteria, mycoplasma and other causes of respiratory infections, will be manifested as a long-term cough has been bad situation. 4. Chronic Obstructive Pulmonary Disease (COPD): due to airflow limitation, may lead to pulmonary ventilation dysfunction, clinical manifestations of morning cough mainly, night cough. With the development of the disease, there may be shortness of breath after activity and other manifestations. In addition, there are other reasons can cause long-term cough bad, such as rhinitis or sinusitis nasal secretion reflux stimulation of pharyngeal cough, gastroesophageal reflux stimulation of pharyngeal cough, etc., but also may be lung diseases such as pulmonary fibrosis, lung tumors, etc., it is recommended to seek medical attention in a timely manner, improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment.