In the vast majority of cases, the likelihood of a micronodule in the lungs developing into lung cancer is relatively low, but it is not possible to generalize, and in some cases it may develop into lung cancer. Most of the micronodules in the lungs are detected by CT of the lungs during physical examination, and most of them are benign lesions. They can be caused by factors such as calcified nodules, lung infections, and atmospheric pollution. In addition, autoimmune diseases can also present with micronodules in the lungs. Usually there is no burr sign, the boundary is clear, and it is not very serious and does not require special treatment. Although the majority of lung nodules are not cancerous, it is not absolute. Especially in patients with a family history of tumors and a history of smoking, micronodules can be observed in the lungs if the tumor has not yet grown and is detected in time. Once the nodules are detected, they should be followed up regularly; if the edges of the nodules show burr signs and the nodules tend to increase in size during the follow-up process, further pathological examinations should be conducted and relevant treatments should be taken according to the actual conditions of the disease, so as to avoid delaying the disease.