Detecting the benign or malignant of lung nodules can be judged by laboratory examination, imaging examination and pathological examination. 1. Laboratory examination: Tumor marker test and sputum exfoliative cytology can provide a certain reference basis for the diagnosis of benign or malignant lung nodules. 2. Imaging examination: the common methods of imaging examination are X-ray examination and chest CT scan, etc. Usually, those in the anterior segment of the upper lobe of both lungs are mostly lung cancer, while those in the posterior segment of the upper lobe tip or the dorsal segment of the lower lobe are mostly benign; the larger the lung nodule, the higher the probability of malignancy, and those less than 5.0mm have a high probability of being benign; those with non-uniform density of lungs, small bubbles in the nodule, small eccentrically located cavities are mostly malignant, and those with uniform density of lung nodules are mostly benign. Those with uniform density are mostly benign. 3. Pathological examination: the common methods of pathological examination include bronchoscopy, thoracoscopy, lung puncture biopsy through the chest wall, etc. Usually part of the nodule tissue is taken for pathological biopsy, which is the gold standard for diagnosing the benignness or malignancy of the nodule. It is recommended that patients choose regular professional hospitals for examination, combined with a variety of test results to confirm the diagnosis, pay attention to rest in life, and at the same time do a good job of monitoring the condition, and follow the doctor’s instructions for regular review.