Answer:
It is always a good idea to get checked for cancer when showing some symptoms. Cancer is best treated early in the process and can become untreatable at later dates.
A bit more:
It is not common to do routine tests or screenings for bladder cancer as it is with other types, such as mammograms for breast cancer, colonoscopy for colon cancer, etc. But if you are having symptoms of bladder cancer, you need to see a urologist immediately. A urologist will be able to determine if your symptoms actually are cancer symptoms, or if they are caused by a bladder infection.
There are other bladder diseases which can mimic cancer, such as Interstitial Cystitis (IC). IC is a disease of the bladder that causes pain (often extreme pain), blood in the urine, frequent urination, among other things. But IC is not fatal, and there are medications and treatments for the pain and other problems it causes.