Why does peritoneal cancer cause frequent urination?

There is no direct link between Peritoneal Cancer and the urinary system unless there is a tumor implant on the urinary bladder. This can be verified with the help of a Pelvic-CT scan or PET scan. Even MRI of the Pelvic area may show it. But before doing extensive testing, your doctor can check your urine for bladder infection which is a more common cause for increased frequency of Urination.