Small nodules in the lungs are not necessarily related to cough. Small nodules in the lungs with a diameter of less than 8 mm can be reviewed regularly with CT, for example, within 3-6 months, and if there is no change in the nodules, the review period can be extended. If there is a new solid component inside the nodule, or if the solid component increases, or if the diameter of the nodule increases, there may be a risk of cancer, and the patient needs to be seen by a thoracic surgeon to consider whether surgery is needed. Coughing itself is a reflexive defense mechanism through which secretions from the respiratory tract and foreign bodies in the airways can be cleared. There are many causes of cough, mainly respiratory diseases, pleural diseases, as well as cardiovascular factors, central nervous system factors, gastroesophageal reflux disease, and medications can also cause cough. In this case, it is necessary to clarify the cause of the cough, ask the patient for a detailed medical history and the accompanying symptoms of the cough, and find the root cause of the cough and treat it symptomatically.