Health Question

Well-known causes of blood in the urine also include urinary tract blockage, usually the urethra by a stone, a tumor, a narrowing of the opening, or a compression from surrounding structures.
Blood clotting disorders and some medications could provoke blood in the urine. Antibiotics (such as Rifampin), analgesics (Aspirin), and anticoagulants (Warfarin, Phenytoin, and Quinine) commonly cause blood in urine.
Benign or non-cancerous enlargement of the prostate, known as benign prostatic hypertrophy is a common condition in older men that lead to blood in urine.
Chronic diseases such as diabetes, hypertension, and sickle cell anemia and viral infections could also be the cause for blood in the urine. In some cases, strenuous exercise, especially running, could cause repeated jarring of the bladder and thus lead to blood in the urine.
On the other hand, sometimes no cause is found for blood in the urine. If serious conditions such as cancer, kidney disease, and other chronic diseases that cause kidney damage or bleeding are ruled out, the cause for blood in urine is almost certainly not serious.