Anytime you notice blood suddenly appear in a place where you don’t expect it, it can be startling. If it appears during urination, most of us would immediately call the doctor.
The fact is that when the blood appears in the urine stream can tell you what kind of problem you have. If you see blood when you first start to urinate, it’s often a sign of a sore or infection in the penis, possibly caused by a sexually transmitted disease. If the blood shows up in the middle of urination, you may have a prostate problem. Or, if blood shows up as you’re completing urination, it may mean that the problem is due to a bladder infection. Blood in the urine might be a sign of a bladder tumor or a symptom of an underlying urinary tract infection.
However, the most common cause of blood in the urine, no matter where it appears in the stream, is a kidney stone. The stone causes irritation in the urinary tract, which, in turn, causes bleeding. The amount of blood can be undetectable, or it may be obvious. Another sign of a kidney stone is a pain in the back that radiates into the groin and penis.
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