In 2014, about 56,390 men and 18,300 women will be diagnosed with bladder cancer in the U.S., and most will be over 70 years old. While some bladder tumors are benign, malignant tumors pose a threat due to their ability to spread to other parts of the body. Symptoms include blood in urine, abdominal pain, or difficulty passing urine. While the exact cause of bladder cancer is unknown, smoking greatly increases your risk of contracting the disease.