An elderly man, Tom, complained to his doctor about intense pain in the joint area of his big toe. The pain would last several days, subside, and then recur weeks later. Tom’s blood work revealed a very high uric acid concentration (well above the 7.4 mg / dl upper limit). What is this condition commonly called? Give an underlying cause for uric acid buildup in the plasma. How is elevated uric acid associated with the pain that Tom experienced?