There are many reasons why it is not good to have a dry cough all the time, which are commonly found in cough variant asthma, bronchial lung cancer, gastroesophageal reflux disease and so on. 1. Cough variant asthma: Cough variant asthma mainly takes chronic cough as the main clinical manifestation, mostly caused by environment, heredity and other etiological factors, and it will have recurring intractable cough. 2. Bronchopulmonary cancer: bronchopulmonary cancer mostly originates from the epithelium of bronchial mucosa, mostly due to air pollution, ionizing radiation, heredity, history of lung disease and other causes, and manifests itself in the clinic as fever, cough, chest pain and other symptoms. 3. Gastroesophageal Reflux Disease (GERD): GERD is mainly caused by the reflux of gastric juices into the vocal cords, trachea and pharynx. There are other causes of dry cough, such as chronic bronchitis, chronic obstructive pulmonary disease, pulmonary fibrosis, allergic cough, etc. It is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and under the guidance of the doctor for treatment.