From big data, lung nodules have a 30% chance of developing cancer, and 70% of lung nodules are benign tumors. Nodules in the lungs are found during physical examination or examination of other diseases of the lungs. If you find out you have nodules in your lungs you cannot delay and need to go to a professional hospital for the next step of examination in time. There are lung tumor marker test, lung enhancement CT test and bronchoscopy. If the lung nodule is less than 5mm, the general probability of cancer is 1%. If the lung nodules are 11-20mm in diameter, the probability of cancer is 35%-65%. If the lung nodules are larger than 20mm in diameter, the probability of cancer is 80%. From this, it can be seen that the larger the lung nodule is, the higher the probability of cancer, so it is important to develop the habit of regular medical checkups.