Not all ground glass nodules have the possibility of malignant transformation into lung cancer. There is no clinical conclusion on how long it takes for a ground glass nodule to become lung cancer. Patients are advised to review the nodule every three months to clarify whether the nodule has changed. A ground glass nodule is an imaging concept, which refers to the imaging features of the lung that appear similar to ground glass changes when CT examination is done. Minor bleeding and inflammation in the lungs may manifest as ground glass-like imaging changes. A ground glass nodule is generally a benign lesion, but there is also the possibility of malignancy if the nodule grows rapidly, but there is no definite conclusion as to how long it takes. Patients are advised to review their CT regularly, every three months, to observe any changes in the nodule. If the lung nodule is larger than 1 cm in diameter, prompt surgical removal is recommended. In addition, once a patient finds a ground glass nodule in the lung, it is important to consult a doctor promptly to clarify the nature of the nodule so that symptomatic treatment can be given in a timely manner.