It is unlikely that a 2 mm nodule is lung cancer, but you cannot judge whether it is lung cancer based on size alone. Lung nodules of 2 millimeters are generally known as microscopic nodules. Lung nodules of this grade are unlikely to be lung cancer, and it is generally necessary to follow the doctor’s instructions for regular follow-up. Generally speaking, it is not possible to judge whether a nodule is lung cancer or not by the size of the nodule, and it depends on the nature of the nodule, such as the morphology, margins and tumor-lung interface, and internal structural features, etc. If the nodule is shown as a ground-glass nodule or has a burr-like shape at the periphery in the imaging, it is necessary to be vigilant for the possibility of lung cancer. People with nodules in the lungs should follow the doctor’s instructions for follow-up or treatment in a timely manner, so as not to delay their condition and affect their health.