Understanding Bladder Cancer

Bladder Cancer Stages and Classifications

Last updated and reviewed on May 23, 2026.

Understanding Staging

Once bladder cancer is diagnosed, the next step is staging figuring out how far the cancer has grown or spread. Staging is critical because it determines the best treatment plan. Bladder cancer is staged using a system called the TNM system (Tumor, Node, Metastasis), which is combined into an overall stage from 0 to IV.

What are the bladder cancer stages and classifications?

• Stage 0 (Ta and Tis): The cancer is only in the very innermost lining of the bladder and has not grown into any deeper layers. Stage 0a (Ta) looks like small, finger-like growths on the surface. Stage 0is (Tis, or carcinoma in situ) is a flat, high-grade cancer that stays on the surface but is more aggressive. Both are non-muscle-invasive.
• Stage I: The cancer has grown into the layer of tissue just below the inner lining, but has not reached the muscle layer. It has not spread to lymph nodes or other organs.
• Stage II: The cancer has grown into the thick muscle wall of the bladder but has not gone all the way through it. It has not spread to lymph nodes or other organs.
• Stage III: The cancer has grown through the muscle wall and into the fatty tissue surrounding the bladder, or has spread to nearby organs like the prostate, uterus, or vagina. It may have spread to nearby lymph nodes.
• Stage IV: This is the most advanced stage. The cancer has spread to the wall of the abdomen or pelvis, to lymph nodes farther away, or to distant organs such as the lungs, liver, or bones.

Questions to ask your doctor

One of the most powerful things you can do is come prepared with questions for your doctor. Research has shown that patients who actively participate in their own care tend to feel better about their treatment experience and often make decisions that line up with their own values and goals. Do not be afraid to ask questions, take notes during your appointments, or bring a trusted friend or family member along to help you remember what was said.

Questions to ask your doctor

• What stage and grade is my bladder cancer?

• What does that mean for my treatment options?

• Has the cancer spread anywhere else in my body?

• What tests were used to determine my stage, and are there additional tests I should have?

• How does my stage affect my prognosis?

• You might also want to ask whether the staging is final or if more tests are needed.

• Would a second opinion on the pathology (the lab results) be helpful? 

• Will your case be reviewed by a multidisciplinary team, a group of specialists including a urologist, oncologist, radiation oncologist, and others who work together to plan the best treatment? 

Understanding your stage and grade is the foundation for all the decisions that come next.