Gout: Inflammatory Arthritis from Urate Crystals

Gout is a common form of inflammatory arthritis caused by the deposition of monosodium urate crystals in and around joints. The crystals form when uric acid in the blood stays persistently elevated, a state called hyperuricemia. Uric acid is the end product of purine metabolism; humans cannot break it down further because, unlike most mammals, we lack the enzyme uricase. An acute attack presents as recurrent episodes of a red, hot, tender, swollen joint, with pain often severe enough to wake a person at night. About half of first attacks strike the base of the big toe, a presentation called podagra. Diagnosis is confirmed by finding needle-shaped urate crystals in joint fluid under polarized light microscopy. Risk is shaped by a combination of diet, other health conditions, genetics, and kidney function. High-purine foods (organ meats, shellfish, anchovies), alcohol (especially beer), and fructose or sugar-sweetened beverages raise risk; see Fructose and Uric Acid: Why Sugar Raises Gout Risk. Coffee and low-fat dairy show protective associations. Dehydration is a classic trigger because it concentrates uric acid. Treatment has two arms. Acute attacks are calmed with NSAIDs, colchicine, or corticosteroids. Long-term prevention lowers uric acid, most commonly with allopurinol, a xanthine oxidase inhibitor that reduces production. Untreated gout can be complicated by Uric Acid Kidney Stones and by chronic joint damage. Gout appearing in young adults is atypical and merits a workup of kidney function, genetics, and metabolic factors rather than being managed and dismissed. This is general medical information, not a substitute for professional care.