In recent years, many health checkup patients came to our clinic with the conclusion of “small nodules in the lungs”, asking what lung nodules are and whether they could be lung cancer, and those who have a history of cancer review are even more fearful, suspecting lung metastasis. The so-called pulmonary nodule is an opaque nodule with a diameter of less than 3 cm, located in the lung parenchyma, which can be single or multiple. The vast majority of people with small intrapulmonary nodules detected are clinically asymptomatic, and with the popularity of multi-row spiral CT examinations, about 10% of routine annual health screening examinations are found to have intrapulmonary nodules. The risk factors for such cases need to be analyzed, and the relationship between the size, morphology, and density of the lesions and the surrounding structures needs to be identified for timely clinical management. The causes of nodule formation in the lung can be benign or malignant. 37-70% of small pulmonary nodules are transient and benign, and usually shrink and resolve on their own or after anti-inflammatory treatment. There are several scenarios: 1) charcoal deposits (sometimes enlarged lymph nodes) in the lungs caused by long-term smoking and air pollution; 2) tuberculosis or inflammation; 3) benign lung tumors: such as malignant tumors, sclerosing hemangiomas, atypical adenomatous hyperplasia (which can develop into lung cancer); 4) early lung cancer: mostly adenocarcinoma, especially in situ; 5) metastases in the lungs; 6) others: such as sputum embolism, malformation, pulmonary arteriovenous fistula, etc. If a lung nodule is found, an experienced physician should be consulted or further examination should be done to clarify the nature of the nodule. Sometimes it is difficult to determine the nature of the nodule for a while because of the lack of typical features of the nodule, the measures taken at this time are: 1, combined with the examination of tumor markers, such as the normal range, need to be reviewed regularly, the general benign lesions multiplication time is usually > 400 days, most of the malignant lesions multiplication time < 100 days, while the infectious lesions multiplication time is usually < 20 days. 2.If the nodule is purely hairy glass-like and the diameter does not exceed 0.8CM, it is mostly atypical adenomatous hyperplasia, which can be reviewed regularly by CT, starting from once every three months, and then gradually extended. 3. If the nodule is larger and has more solid components, surgery is recommended. Thoracoscopic surgery is preferred. 4.If lung nodules are found to have no change in close follow-up for more than one year, the possibility of malignancy is small, but not absolute; there are clinical cases confirmed to be malignant after 10 years of follow-up resection. However, such lung cancer progresses slowly and has a relatively good prognosis. 5.If the imaging consideration of "lung nodule" is more likely to be tuberculosis or inflammation, experimental treatment, such as anti-inflammatory and anti-tuberculosis treatment, can be done. pathology for the next step of treatment (e.g. radiotherapy). Pulmonary puncture biopsy is indicated for lesions in the periphery of the lung; bronchoscopy, especially ultrasound-guided bronchoscopy for biopsy, is performed close to the center. 7. If there is a high clinical suspicion that the lung nodule is malignant, thoracoscopy or open-heart biopsy is performed as soon as possible. This method can not only remove the lesion and achieve pathological confirmation of the diagnosis, but also achieve the purpose of treatment. If the intraoperative frozen pathology is malignant, expand the surgery and perform lung segment or lobectomy to achieve the purpose of radical treatment. 8, for patients with small nodules not enough to perform puncture biopsy in the process of waiting for regular review, feasible Chinese medicine treatment, Chinese medicine through the soft nodules, heat detoxification, support and eliminate evil, elimination of Y and accumulation of treatment for benign and malignant micro nodules can play a better effect.