For bladder cancer, relying on tumor size alone cannot determine the specific staging, and it is recommended to combine with imaging examination and pathology report to assist in staging. The commonly used clinical staging method for bladder cancer is TNM staging method, in which T stands for tumor itself, N stands for regional lymph nodes, and M stands for distant metastasis. T staging: T1 stage when the tumor is confined to the mucosal layer, T2 stage when the tumor invades into the muscular layer of the bladder, T3 stage when the tumor invades into the tissues around the bladder, and T4 stage when the tumor invades into the adjacent organs of the bladder (e.g., prostate gland, seminal vesicles, uterus, vagina, abdominal wall, etc.). N stage: for regional lymph node metastasis, N0 is no lymph node metastasis; N1 is the presence of regional lymph node metastasis; M stage: for distant metastasis, M0 is no distant metastasis, M1 is the presence of distant metastasis. If the bladder cancer is 1.3 cm, without muscle layer infiltration, without local infiltration, lymph node metastasis and distant metastasis, it is usually in early stage. Therefore, the evaluation of bladder cancer staging needs to be combined with imaging and pathological examination for comprehensive judgment, and cannot be evaluated only by tumor size. It is recommended to go to regular hospitals for comprehensive evaluation of the condition and follow the doctor’s instructions to control the progress of the disease, so as to avoid delaying the condition.