What is Non-Muscle Invasive Bladder Cancer?GuidanceCancerOncology • • •

According to recent research, bladder cancer is the 12^th most common type of cancer worldwide.¹ Of these cases, doctors stage (referring to the process of how far the cancer has progressed) about 75% as non-muscle invasive bladder cancer (NMIBC).¹ Unlike other forms of bladder cancer, NMIBC only develops in cells that line the inside of the bladder, also known as urothelial or transitional cells.²

The bladder is made up of several layers, and in most cases, bladder cancer begins in the innermost layer. With NMIBC, cancer typically remains confined to the lining of the bladder and may extend into the connective tissue without reaching the muscle layer. Because of this, doctors classify NMIBC as an early-stage cancer, usually stage 1.³

Understanding where cancer develops within the bladder is essential, as it helps guide treatment decisions and long-term management.

How does NMIBC differ from other bladder cancers?

The key difference between NMIBC and other forms of bladder cancer is how deeply cancer cells grow into the bladder wall. While NMIBC is limited to the innermost layer and connective tissue, other types of bladder cancer, such as muscle-invasive bladder cancer, spread deeper into the bladder muscle itself. Advanced bladder cancer, also called metastatic bladder cancer, spreads beyond the bladder into other parts of the body.³

NMIBC risk factors, symptoms, and diagnosis

Non-muscle invasive bladder cancer results from various behavioral, environmental, and genetic factors. Smoking is the most significant risk factor for NMIBC, although quitting smoking can reduce risk over time. Other risk factors include exposure to certain chemicals that cause cancer, such as arsenic; the use of some chemotherapy medications; genetic syndromes such as Lynch syndrome; and a history of radiation therapy to the pelvic region.^1,4

The symptoms of NMIBC can vary greatly from person to person, and some people may not notice symptoms at all. Still, changes in urinary health should always be discussed with a doctor. Symptoms may include:⁴

• Blood in the urine (hematuria)
• Back or lower abdomen pain
• Frequent and sudden need to urinate
• Pain when during urination

These symptoms can also be caused by other medical conditions, such as kidney stones or infections. Speaking with a doctor helps ensure that any underlying issues are properly evaluated.

Diagnosis often begins with a review of medical history and a urine test to detect blood or abnormal cells. Imaging tests such as ultrasound, computerized tomography (CT) scan, or magnetic resonance imaging (MRI) may be used to identify abnormalities in the urinary tract.¹

To confirm a diagnosis, doctors perform a cystoscopic evaluation. During this procedure, a thin tube with a light and camera on the end is inserted into the bladder, allowing the doctor to examine the lining and identify tumors.¹

NMIBC treatment

Treatment approaches for NMIBC depend on the characteristics of the cancer and the needs of the individual.

In some cases, NMIBC is detected at such an early stage that doctors recommend watchful waiting. Instead of actively treating the condition, this approach involves monitoring for changes that could indicate progression.⁴

When treatment is required, doctors commonly perform a procedure called transurethral resection of bladder tumor (TURBT).¹ During TURBT which is performed under anesthesia, a cystoscope is used to remove tumor tissue from the bladder. If possible, the entire tumor is removed. Doctors may also collect additional tissue samples to determine whether cancer cells are present elsewhere in the bladder.⁴

Another treatment option is intravesical therapy, in which medicines such as chemotherapy or immunotherapy are placed directly into the bladder.⁵ These treatments can help destroy any remaining cancer cells and stimulate your body's own immune system to fight them.⁴

In rare cases, complete removal of the bladder is necessary to prevent cancer from advancing further. This is typically only necessary when NMIBC involves a large portion of the bladder.⁶

Because NMIBC can recur, ongoing follow-up care is an important part of disease management. Even after successful treatment, up to 50 percent of patients experience cancer recurrence within one year. In these cases, additional treatment such as another TURBT procedure or intravesical therapy may be recommended.¹

Moving forward with NMIBC

NMIBC is a common diagnosis, and it can often be managed with the support of a care team. Non-muscle invasive bladder cancer is an often-misunderstood diagnosis, and many people think all types of bladder cancers develop and are treated in the same way. But so much depends on the location of cancer cells within the bladder tissues.

Recognizing early symptoms of bladder cancer can make a difference in when and how you receive treatment. With appropriate monitoring and treatment, many people with NMIBC are able to maintain their quality of life while managing their condition.

Learn more about bladder cancer here.

References

1. Manivasagam SS, Kassim A, Raman JD. Diagnosis, evaluation, and management of patients with non-muscle invasive bladder cancer. Future Science OA. 2026;12(1):2622297.
2. What is non-muscle invasive bladder cancer? Bladder Cancer Advocacy Network. https://bcan.org/what-is-non-muscle-invasive-bladder-cancer/. Updated September 18, 2025. Accessed April 12, 2026.
3. Bladder cancer stages. National Cancer Institute. https://www.cancer.gov/types/bladder/stages#:~:text=Stage%20I%20is%20a%20form%20of%20non%2Dmuscle%2Dinvasive,reached%20the%20muscle%20layers%20of%20the%20bladder. Updated May 16, 2025. Accessed April 14, 2026.
4. What is non-muscle invasive bladder cancer? Urology Care Foundation. https://www.urologyhealth.org/urology-a-z/n/non-muscle-invasive-bladder-cancer. Updated June 2024. Accessed April 14, 2026.
5. Jin YH, Zeng XT, Liu TZ, et al. Treatment and surveillance for non-muscle-invasive bladder cancer: a clinical practice guideline (2021 edition). Military Medical Research. 2022;9:44.
6. Bladder cancer treatment. National Cancer Institute. https://www.cancer.gov/types/bladder/treatment. Updated September 12, 2024. Accessed April 14, 2026.