Uric acid is a waste product formed when the body breaks down purines, which are substances found in certain foods and drinks. It is normally dissolved in the blood and excreted through the kidneys in urine. However, high levels of uric acid in the blood, a condition known as hyperuricemia, can lead to the formation of crystals in joints, causing gout, a painful form of arthritis. Elevated uric acid levels may also increase the risk of kidney stones and other health issues. Diet, genetics, and certain health conditions can influence uric acid levels.