The bladder is a hollow organ in the lower abdomen whose main function is to store urine before it is expelled from the body. Bladder cancer occurs when cells cancersosas in the inner membrane of this body are formed, and its symptoms are painful urination or lower back, frequent urination and blood in the urine. The main risk factors are smoking and exposure to certain chemicals, along with a family history of the disease. This type of cancer can be limited to the lining of the bladder, and then called surface or spread through the lining of the bladder and even to nearby organs, which are called invasive in this case. Treatment depends on the severity and type of cancer, but may generally include radiation therapy, chemotherapy and / or surgery.