Blood in the urine is never normal. Causes can include urinary tract infection, prostate infection, kidney stones, kidney disease, or bladder cancer. Simple things like vigorous exercise can also cause microscopic blood in the urine.
Depending on the age, a cystoscopy or IVP can be considered to evaluate the urinary tract and bladder, a CT scan be done to evaluate for kidney stones, and an ultrasound be done to examine the kidney stucture. Of course, the prostate should also be checked for infection.
These options should be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.