Older people often cough for a long time without getting well include the following causes: 1. cough caused by colds, bronchitis, pharyngitis, and pneumonia; 2. postnasal drip syndrome, which refers to nasal snot passing through the nose and stimulating the pharynx, which can cause a cough; 3. gastroesophageal reflux disease, which refers to weakened gastrointestinal function and gastroesophageal reflux stimulating the pharynx, which can also cause a cough; 4. allergic diseases, such as to pollen, Allergic diseases, such as allergies to pollen, mites, and various things that cause irritation, are called variant coughs, referring to allergic coughs; 5. Occupational lung cancer can also cause irritating coughs; 6. Drug-induced coughs.