Uric Acid Crystals. Your Kidneys Take Uric Acid Out Of Your Blood And Put It Into Urine So That It Can Leave Your Body. But If Your Body Is Making Too Much Uric Acid, The Level In The Urine Can Get Too High. High Levels Of Uric Acid Can Cause Crystals To Form In Joints. This Causes A Painful Problem Called Gout.

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