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Your bladder is the hollow, muscular organ in your lower belly where urine is stored. When you urinate, the muscles of your bladder contract and push urine out through a tube called the urethra. Bladder cancer starts when cells in the bladder start to grow out of control. These cells can form into a bladder tumor. They can also spread outside your bladder to lymph nodes and to structures far from the bladder, like your bones, lungs or liver. This is known as metastasis.