There are several reasons why you might notice blood in your urine, including:
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Bladder, kidney, prostate, or urinary tract infections
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Traumatic injuries
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Strenuous exercise
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Certain medications, such as blood thinners and antibiotics
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Viral illnesses, such as hepatitis
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Sexual activity
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Menstruation
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Digestive and kidney diseases, such as polycystic kidney disease
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Certain types of cancer, such as bladder cancer
In some cases, urine may change colors due to dietary choices. Certain foods, such as beets, blackberries, and rhubarb, can change the color of your urine.