A 10mm nodule found in the lungs may be caused by infection, malignant tumor, benign lesion, etc. It can be treated with anti-infective therapy, surgical resection, and regular follow-up observation. If a 10mm nodule is found in the lung, if it is considered to be caused by infectious diseases, active anti-infectious treatment can be given, and the nodule may become smaller or disappear after treatment. If the shape of the nodule is irregular with lobulation, burr, eccentric calcification, etc., it is more likely to be malignant, in which case the nature of the nodule can be clarified by CT-guided lung aspiration biopsy. If the pathologic result suggests that the nodule is malignant, thoracoscopic surgical resection is required. If the pathology suggests that the nodule is benign, it can be followed up regularly. If it is not possible to obtain the pathological tissue of the nodule by CT-guided lung puncture, for the nodule with high suspicion of malignancy, the lung nodule can be directly resected under thoracoscopy to clarify the pathology, and if it is a malignant nodule, radical surgery for lung cancer is required. If the lung nodule is found to be 10mm in the lung examination, it is recommended that the patient should consult the doctor in time to clarify the cause of the disease and carry out treatment under the doctor’s guidance.