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It should be reassuring to know that most patients with blood in the urine do not have a serious underlying condition. For patients with microscopic blood, about 3% will ultimately found to have a cancer somewhere in the urinary tract. The other 97% are not found to have any cancer. When the blood is visible, the number is higher. About 13% of patients with visible blood in the urine are ultimately found to have a cancer somewhere in the urinary tract.