This document discusses crystal-induced arthritides such as gout, which is an inflammatory arthritis associated with hyperuricaemia. Acute gout often affects the first metatarsophalangeal joint, causing sudden and severe pain. Chronic gout can lead to tophaceous deposits of urate crystals in tissues. Hyperuricaemia is generally caused by either impaired uric acid excretion or increased production, and treatment involves medications like allopurinol to reduce uric acid levels as well as lifestyle changes. Pseudogout is another type of crystal arthropathy seen in elderly women that involves calcium pyrophosphate crystal deposition.