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Causes and Symptoms for Bladder Cancer
Over 90 percent of bladder cancers are transitional cell carcinomas, or cancers of the cells lining the bladder, ureters, and urethra. The exact causes are largely unknown, but both genetic and environmental factors are responsible. In the United States bladder cancer is three times as likely to affect men as women, and whites are twice as likely to be affected as blacks. The most significant risk factor associated with bladder cancer is smoking; carcinogens (cancer-causing agents) are absorbed through the lungs into the bloodstream, where they are filtered out by the kidneys and enter the urinary tract. An environmental risk is presented by a class of organic chemicals called arylamines. People who work in the leather, rubber, printing, and textiles industries or with large quantities of paint are often exposed to these chemicals and should exercise caution in their use.
As with many cancers, advanced age is a risk factor, and most bladder cancers are diagnosed after the age of 60. Chronic bladder inflammation, such as that caused by recurrent bladder infections, is a risk factor, as are rare, inherited birth defects related to the development of the bladder.
The symptoms of bladder cancer are nearly identical to those of urinary tract infections and other diseases of the urogenital system. These symptoms include blood in the urine, difficulty urinating, excessive urination, or, more rarely, painful urination.
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