1. Infection in the Urinary Tract: Urinary tract infections or UTIs are caused by bacteria which multiply in the urinary bladder after entering the body through the urethra. The associated symptoms of the condition might be bloody urine, frequent need to urinate, painful urination and odorous discharge.

2. Kidney Stones/Bladder stones/Ureteric stones: Stones anywhere in urinary tract can cause it.

3. Cancer in the Kidney, Prostate, Bladder and Urethra: Growth of cancerous cells or tumors leads to internal bleeding.

4. Side-effects of Medication: Blood-thinners or anti-coagulants might cause bleeding and the blood is released with urine. Some Chemotherapy like Cyclophosphamide may also cause hematuria in rare cases.

5. Disorders of the Prostate Gland: The prostate gland may enlarge with advancing age and this creates undue pressure on the urinary tract. This blocked flow of urine may result in the presence of blood in urine.

6. Over Exertion or Excessive Physical Activity: This possible cause of hematuria is not often associated with medical disorder and is a physiological consequence.

7. Medical renal Diseases: may show the symptom of blood in urine.

Blood in urine is a serious symptom and even a single self-resolving episode must not be neglected and need to be evaluated in greater detail by medical professional