I believe him. I was peeing what looked like hersey syrup before my operation. sometimes red, sometimes almost black. Doc kept saying kidney stones. Well, I did have a kidney stone, and a mass on my kidney. When I finally convinced the doc it was more than a kidney stone they ordered a CT scan, next day they called me up and ordered a CT scan with contrast, the next day they had me set up with a Urologist, who imediantly sent me to a surgon. The surgon scheduled me a time for an operation. He removed a kidney stone that looked like gravel and a piece of my kidney. Stage 3 kidney cancer, now takin Keytruda infusions every 3 weeks. Surgon says he got all the cancer and the Keytruda is just insurance. My suggestion to the OP, or anybody else that might be peeing blood, is demand a CT scan. I argued with my doctor for 9 months before they decided to order the CT scan. Another 9 months and it could have been stage 4 with no hope.