Prevention of nodules requires a healthy lifestyle, good daily protection and regular medical checkups. 1. Adopt a healthy lifestyle: Quit smoking and drinking. Adopt good dietary habits, eat more fresh vegetables and fruits, keep a happy mood, exercise properly, and avoid staying up late. 2. Do a good job of daily protection: in the smoke is thick, dusty, air is not fresh place to wear a mask to prevent dust into the respiratory tract. If your occupation requires you to be in such an environment, you must do a good job of protection. 3. Regular physical examination: low-dose spiral CT examination should be carried out regularly, and the frequency of examination should be increased if there is a family history of cancer. The onset of nodules is insidious and there are no obvious symptoms in the early stage, so it is recommended to do a good job of prevention to reduce the occurrence of the disease.