A 1.3 cm lung nodule should first be determined to be lung cancer. If it is lung cancer, it should be combined with lymph node metastasis and distant metastasis to determine whether it is early stage or not. First of all, not all lung nodules are lung cancer, so pathological examination is needed to determine whether they are lung cancer. If it is lung cancer, its specific stage cannot be judged only by the size of the nodule, but should be combined with lymph node and distant metastasis. According to TNM (primary tumor, degree of lymph node metastasis, whether distant metastasis occurs) staging, 1.3 cm lung cancer nodule is T1b, and the tumor should also be staged by combining the N and M conditions. It can be stage I-IV in TNM staging, in which stage I is early stage, stage II-III is mostly intermediate stage, and stage IV is advanced stage. When patients are diagnosed, they should cooperate with doctors for timely treatment in order to obtain a high survival rate.