Frequent cough is not serious generally means that the patient coughs frequently but to a lesser extent, which may be caused by chronic bronchitis, cough variant asthma, post-infectious cough and so on. 1. Chronic bronchitis: if the patient is often exposed to dust or often inhale harmful gases, it will cause some chronic inflammation to the trachea-bronchial mucosa, thus appearing frequent cough. 2. Cough variant asthma: if the patient is often exposed to allergens, such as pollen, dust mites, etc., it will lead to airway inflammatory response, which will lead to airway smooth muscle contraction, mucus secretion increases, and frequent coughing occurs. 3. Post-infectious cough: mainly secondary to previous respiratory infections, such as secondary pertussis infection, the airway inflammatory response persists, and frequent coughing occurs. Frequent cough is not serious can also be caused by other reasons, it is recommended that patients such as persistent cough does not get better or aggravate the situation, go to the hospital in a timely manner to improve the relevant examination, under the guidance of the doctor to actively treat, so as to avoid aggravation of the symptoms.