Whether or not a 5 mm ground-glass nodule is serious is mainly determined by the condition of the nodule. Benign nodules are not considered to be particularly serious; malignant nodules are suspected to be relatively serious. Benign nodules are mainly caused by pneumonia, tuberculosis, pulmonary hemangioma, etc. The edges of the corresponding nodules are relatively smooth, usually appearing as wedge or pike shaped, and there will be no real change and obvious increase in size during the review process, which belongs to the milder type. If the edges of the nodules are not smooth, and malignant signs such as burrs, lobules and vacuoles can be seen, the condition is relatively serious, and failure to control it in time may lead to disease progression. The discovery of ground-glass nodules requires regular review, and if enlargement and solid changes occur during the review process, it is necessary to consult a doctor in a timely manner and carry out standardized treatment under the guidance of the clinician, so as to avoid delays in the condition.