It is normal not to cough for years, coughing is a physiological manifestation in response to stimuli, or a pathological phenomenon in some diseases. Cough is a symptom that can occur on its own accord and is a protective mechanism of the organism, but has a wide range of etiologies and varies in severity. Coughs are usually divided into 3 categories according to time: acute, subacute and chronic coughs. Coughs can be caused by a variety of diseases, including respiratory, digestive, nasal, cardiovascular or associated neuromuscular problems. It is normal to not cough for years, which is a relatively good thing and not something to worry about. If you have a recurrent or frequent cough, you need to consult a doctor, complete the relevant examinations, identify the cause of the disease, and standardize the treatment under the guidance of the doctor.