The common causes of old people’s old recurrent cough are: chronic bronchitis, chronic pharyngitis, tuberculosis, lung tumors and so on. 1. Chronic bronchitis: long-term smoking, exposure to dust and chemicals is an important factor in the occurrence and development of chronic bronchitis. When the elderly suffer from chronic bronchitis, they will have cough and sputum for a long time, which may be accompanied by wheezing and shortness of breath. Coughing in the morning is usually the main cough, and there can also be bouts of coughing during sleep. 2. Chronic pharyngitis: Because many elderly people have a salty diet, heavy taste, long-term smoking and drinking, chronic pharyngitis is very easy to appear. Chronic pharyngitis will have repeated coughing, throat itching, hoarseness, foreign body sensation, burning sensation and other manifestations. 3. Tuberculosis: Due to the weak resistance of the elderly and the decline of the functions of various organs of the body, it is easy to be infected by tuberculosis bacillus, leading to the occurrence of tuberculosis, which is manifested by repeated coughing, coughing up sputum, accompanied by hemoptysis and other typical symptoms. 4. Lung tumor: old people are the most common group of lung tumor, when old people suffer from lung cancer and the cancer foci invade the mucous membrane of trachea, it will lead to the stimulation of the mucous membrane of the trachea, which will lead to the symptom of recurrent coughing. In addition to the above diseases, there are also other diseases that cause recurrent coughing in the elderly, it is recommended to go to regular hospitals in time, to clarify the cause of the disease, and to target treatment.