Lung nodules do not necessarily cause cough. The clinical symptoms of patients with lung nodules are closely related to the location and size of the nodules, whether they are compressing or invading neighboring organs, and whether they are malignant and have metastasis. Most lung nodules are located in the lung fields, far away from the airways and pleura, and patients often do not have any symptoms, mostly found during chest examination. When the lung nodules grow to a certain extent, they can involve the surrounding bronchial tubes or pleura, and then coughing symptoms will appear. If the lung nodules continue to increase in size, causing airway obstruction, or affecting the discharge of distal secretions, they can cause lung expansion insufficiency and lead to lung infections, which can be accompanied by coughing and sputum in addition to coughing. In addition, cough is a non-specific clinical symptom, and can be caused by many diseases of the lungs. Common causes include inhalant irritation, tracheitis or bronchitis, allergies, climate change, or certain drugs such as Benadryl. Patients with pulmonary nodules who have a combination of coughs need to have the cause of the cough identified and different treatments chosen depending on the cause of the cough. Lung nodules are round or irregular shaped lesions with a diameter of ≤3cm in the lungs, which are characterized by increased density in the lungs on imaging, while small nodules are increased density with a diameter of <1cm. The difference is that small nodules are smaller in diameter.