Lung nodules are a common disease. There are more diseases of lung nodules, besides cancer, there are inflammatory as well as proliferative nodules, and immune diseases. The most common cause of lung nodules is still inflammation, so once a nodule is found in the lung, it should be actively further examined to clarify its nature and then targeted treatment. If the nodule is inflammatory, anti-inflammatory treatment is actively taken, and it will usually disappear after anti-inflammatory treatment. Of course, inflammatory nodules are usually small, but if the nodules are large, in this case, attention must be paid to the possibility of cancer; enhanced CT, or PETCT, as well as bronchoscopy, lung aspiration and other related examinations are recommended to clarify its diagnosis. Even if it is cancer, don’t worry too much, there are more and more means to treat cancer, and its efficiency is getting higher and higher, many patients can be cured if it is early stage, so active treatment can bring hope, don’t give up at any time, medicine is progressing, maybe one day we can overcome cancer. If lung nodules are found in physical examination or during examination, please do not worry too much, the cause of lung nodules is not necessarily cancer, actively cooperate with doctors for examination and treatment.