Jogging can cause blood to appear in the urine if this activity causes trauma to the urinary tract, which includes the urethra, bladder, ureters and kidneys, explains Mayo Clinic. Blood in the urine, also called hematuria, is not a normal condition, but it can be triggered by strenuous exercise.
There are two types of hematuria: gross and microscopic, says the National Kidney and Urologic Diseases Information Clearinghouse. Gross hematuria results in visible blood contamination of the urine, evidenced by the urine having a red, pink or brown color. Microscopic hematuria describes the presence of blood in the urine in such small quantities that it can only be seen under a microscope.
Joggers who experience hematuria most often exhibit gross hematuria, where visible blood contamination can be seen during urination after strenuous exercise, states the Cleveland Clinic. Generally, gross hematuria in athletes is called sports hematuria, but the exact cause for blood in the urine following strenuous exercise is not known. Nevertheless, the presence of hematuria, gross or microscopic, can indicate a potentially serious illness or internal injury and necessitates a full medical evaluation to rule out medical conditions.
In approximately 8 to 10 percent of cases of hematuria, there is no cause identified, explains the Urology Care Foundation. Potential conditions indicated by gross and microscopic hematuria include bladder cancer, urinary tract infection, kidney disease and pyelonephritis.