Pulmonary nodules with frequent dry cough may be caused by infections, non-infectious diseases, and tumors of the lungs. 1. Infections, such as viral, bacterial and Mycobacterium tuberculosis infections causing inflammatory pseudotumors of the lungs, the inflammatory substances will stimulate the airway mucosa and cause coughing. 2. Non-infectious diseases: for example, idiopathic diffuse interstitial fibrosis and calcification of the lungs appear as fibrotic nodules, with the development of the disease, the respiratory mucosa will be severely irritated, which will lead to cough symptoms. 3. Tumor: Carcinomatous lesions in the lungs, such as bronchopulmonary carcinoma and other carcinomatous nodules, will compress the airway mucosa and cause cough. The causes of lung nodules with frequent dry cough are very complicated, it is recommended to consult a doctor in time, complete the relevant examinations under the guidance of the doctor, and systematic treatment after clarifying the cause of the disease.