Lung nodules 11mm are usually large, and even if there are no other symptoms, it is necessary to actively seek medical attention to identify the cause of the disease in order to determine the severity of the disease. In general, if the nodule is malignant, the condition is more serious. Lung nodules can be caused by a variety of diseases. Benign causes include tuberculosis, fungal infections of the lungs, pulmonary hemangiomas, benign tumors of the lungs, and other diseases. Malignant causes include primary neoplastic diseases such as lung adenocarcinoma, squamous cell carcinoma of the lung, or other tumors that metastasize to the lungs and cause nodules. If the nodule is malignant, it is usually more serious and requires timely treatment such as surgical resection if surgery is indicated; if it is an infected nodule, it should be treated with timely anti-infective therapy; and if it is a pulmonary nodule of unknown etiology but considered to have a high risk of malignancy, thoracoscopic surgery can be performed to clarify the nature of the nodule if necessary. For other lung nodules that are considered to have a high possibility of being benign, they can be followed up regularly for observation. It is recommended that the relevant groups of people should consult the doctor in time to determine the severity of the disease after clarifying the cause and nature of the nodules, and follow the doctor’s instructions for treatment or follow-up, so as to avoid delaying the disease.