1 in 5 Patients are Unaware of their Arthritis Diagnosis Current CDC numbers suggest that arthritis (any type) affects an estimated 67.1 million (27.9% ) adults in the USA. Interestingly, 1 in 5 do not know their arthritis subtype (21.6%, 14.4 million). https://t.co/G8zeP1K5X9 https://t.co/BdDFVSUuFf