A recurrent bad cough can be caused by a variety of reasons, the most common of which include chronic bronchitis, allergic diseases, and upper airway cough syndrome. 1. Chronic bronchitis: chronic inflammation of the airways due to long-term smoking or exposure to dust and chemicals can lead to recurrent coughing and sputum coughing with or without wheezing. 2. Allergic diseases: such as allergic cough, caused by seasonal changes or repeated exposure to allergens, causing airway inflammation and recurrent cough symptoms. 3. Upper airway cough syndrome: such as rhinitis, sinusitis, due to nasopharyngeal secretions flow to the pharynx, stimulating cough receptors, thus causing patients to cough repeatedly. There are many other reasons for recurrent coughing, it is recommended that if the symptoms of recurrent coughing occur, you should consult a doctor in a timely manner, improve the examination, identify the cause of the disease, and comply with the doctor’s instructions for treatment.