Hello - thanks for asking your question.
Blood in the urine (i.e. hematuria) should be worked up. Kidney stones are just one cause of blood. They may or may not be associated with flank pain.
However, you have to consider kidney disease, bladder cancer, prostate diseases or any type of genitourinary infection.
I would be evaluated by a physician or urologist. A urinalysis and culture and blood tests for kidney disease should be be performed. Ultrasound of the kidneys or a spiral CT scan can be done to evaluate for stones.
A cystoscopy would be the most thorough test to make sure that cancer isn't present and this 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.
Thanks,
Kevin, M.D.