How would you know if you a bladder infection or bladder cancer?

Symptoms: Pain with urination, urinary frequency, and passing blood in the urine can be symptoms of bladder cancer or infection. Sending a urine specimen to the lab can help differentiate the two, but the definitive test is a cystoscopy. In this exam a urologist inserts a camera into the bladder through the urethra and taking a sample of any abnormal growths.