Young people have relatively more and more lung nodules because as the general health concept of the population improves, more and more attention is paid to their own physical examination, there are more and more physical examinations once every 6 months or even once every 3 months. Especially after the standard physical examination of each unit every 1 year, through double lung X-ray or CT, or even MRI is becoming more and more popular, more and more young people will find lung nodules, more than in previous years. In fact, in most cases, benign lesions are the most common, due to infection by pathogens, such as Mycobacterium tuberculosis and other bacterial infections after the increase in their own resistance to inflammation gradually subsided and healed leaving fibrosis and calcified nodules. These old lesions do not require special treatment, and only a very small number of patients will develop malignant occupying lesions, such as bronchial lung cancer.