Microscopic nodules on the lungs are tiny nodular lesions found on the lungs when a chest CT is done. Tiny nodular lesions are generally lesions that are smaller than five millimeters. Generally speaking, if the patient does not have obvious symptoms such as coughing, coughing, chest pain and hemoptysis, he can be observed clinically first. If the lesion does not grow, clinical observation can be continued. If the nodule is found to have a tendency to grow, or if the patient has symptoms such as cough, chest pain, or even hemoptysis, further examination should be done in hospital, including enhanced CT, bronchoscopy, CT-guided puncture, and if necessary, surgical thoracoscopic surgery to remove the nodule to further clarify the diagnosis.