Gout is a form of inflammatory arthritis that occurs when uric acid accumulates in the body and forms sharp crystals in the joints, triggering intense pain and swelling. For many people, the first gout attack begins in the big toe, though other joints in the lower limb - such as the ankle and knee - can also be affected.
Uric acid is a natural by-product formed when the body breaks down purines - compounds found both in the body's own cells and in certain foods. While some uric acid is beneficial (it acts as a powerful antioxidant), excessively high uric acid levels lead to crystal formation and, ultimately, gout attacks.
Gout progresses through three recognised stages:
- Asymptomatic hyperuricemia - elevated uric acid levels with no symptoms yet present.
- Acute gout - a sudden and severe gout attack causing intense joint pain within 24 hours of onset.
- Chronic tophaceous gout - repeated flares lead to the formation of tophi (densely packed urate crystal deposits), causing permanent joint damage.