Uric acid crystals are tiny, needle-like structures that form when there is an excess of uric acid in the body. Uric acid is a waste product created when the body breaks down purines, substances found in certain foods and drinks. When the levels of uric acid become too high, it can lead to the formation of these crystals, which can accumulate in joints and tissues. The presence of uric acid crystals is often associated with gout, a type of arthritis characterized by sudden and severe pain, redness, and swelling in the affected joints. These crystals can also lead to kidney stones if they accumulate in the kidneys. Managing uric acid levels through diet and medication can help prevent crystal formation.