I am 52 years old male and I have undergone bypass surgery 3 months ago,for the past three days I notice that blood in my urine,but there is no pain while urinating.But stomach and back pain is there,but this color change in urine and pain in the stomach and low back pain are gone while I am taking the pills for urinary track infection and pain killers,but the same is repeating while I stop the tabs for a day or two.Please clarify me why this happens so?