Gout is a form of arthritis caused by the formation of painful uric acid crystals in the joints. This condition often affects the big toe, and causes swelling, stiffness, and pain in the affected joint. Gout is sometimes called the disease of kings, as it can be aggravated by foods like red meat, seafood, and alcohol. These foods are high in a substance called purines, which produce uric acid when broken down by the body. Learn more about the causes, symptoms, and treatments for gout in the articles below.