what is the problem if you have  blood in your urine
6. Abnormalities of blood clotting, usually inherited (e.g. haemophilia), can cause blood in the urine which is usually painless. Only a few patients with blood in the urine will have bleeding disorders but identifying them is important since bleeding can occur elsewhere and is usually preventable by treatment.
Symptoms That May Accompany Hematuria. If there is blood in urine, the symptom is obvious. Instead of its normal pale yellow color, your urine may be pink, red, brownish-red, or tea-colored. This is what doctors call gross hematuria. Sometimes, blood in urine is not visible to the naked eye and the presence of red blood cells can only be detected by the lab.
Cancer. Sometimes, having bloody urine may be a sign of advanced cancer in any of your urinary organs. However, your doctor will be the one to determine whether the cause of your hematuria is cancer or not. Medications. Some medicines may cause hematuria to happen, such as aspirin, heparin and certain antibiotics.