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I have had blood in my urine just like you explained for years. I always had pelvic pain as well. About 3 years ago I was diag with Interstitial Cysitis (IC). It's a bladder disease and will cause blood in the urine. Once I was diagnosed other things made sense. I felt pains that I had no idea were my bladder all those years. My OBGYN finally sent me to a Urologist and they were able to make the diag fairly quickly.
Blood in Urine Causes. 1  Infection: Blood in the urine can be a sign of urinary tract infection (UTI). An infection can be present in the lower urinary tract (bladder and urethra) or higher in the urinary tract (kidneys or ureters).  Nephrolithiasis: Kidney or bladder stones may form inside the urinary tract and can cause bleeding into the urine.