How do monosodium urate crystals cause gout attacks?

Gout is a form of crystalloid arthritis triggered by the precipitation and deposition of needle-shaped monosodium urate crystals within the joint space. These crystals are a form of uric acid, a metabolic byproduct of purine breakdown that is normally excreted by the kidneys.12

When levels of serum uric acid become excessively high—a condition known as hyperuricemia—these salts can crystallize in and around the joints and cartilage. The presence of these crystals in the joint space initiates an acute inflammatory response, which manifests as the intense pain, redness, warmth, and tenderness characteristic of a gout attack. While initial attacks are often self-limiting, the persistent presence of these deposits can lead to chronic tophaceous gout, where large nodules called tophi accumulate in soft tissues and joints, resulting in chronic pain and potential joint destruction.21