There are many reasons why the cough is always bad, commonly found in chronic obstructive pulmonary disease, bronchiectasis, cough variant asthma, gastroesophageal reflux disease, and occupational lesions in the lungs. 1. Chronic obstructive pulmonary disease (COPD): manifested by chronic coughing and sputum, dyspnea can occur in severe cases, and it is heavier in the morning. 2. Bronchiectasis: manifested by persistent or recurrent coughing, coughing up sputum and coughing up purulent sputum. 3. Cough variant asthma: mainly manifested as irritating dry cough, usually cough is more violent, night and early morning cough as its important characteristics. 4. Gastroesophageal reflux disease (GERD): a clinical syndrome characterized by coughing due to reflux of gastric acid and other gastric contents into the esophagus. Chronic coughing is common during the daytime. 5. Intrapulmonary space-occupying lesions: irritating cough can occur, need to clarify the condition, active treatment. There are many reasons why the cough is always bad, it should be taken seriously, timely consultation, identify the cause of the disease, under the guidance of the doctor for treatment.