Blood in the urine is understandably alarming, and it should be. It's one of the symptoms people tend to act on quickly, which is the right instinct. That said, it isn't exclusive to kidney disease; kidney stones can cause it too, and sometimes the blood is only detectable under a microscope rather than visible to the eye.
Kidney disease can also cause other changes in urine color. Either way, don't try to self-diagnose. A doctor can find the cause and, if it turns out to be nothing serious, give you peace of mind.

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