Rheumatoid Arthritis (RA) is an autoimmune disease, like AIDS, that causes the body to attack itself. It is chronic, progressive, deforming and as yet incurable. Diagnosed with RA at 17, Karen Ager has worked relentlessly to raise public awareness of the disease.In her new book, Enemy Within, Karen shares her inspirational journey of personal suffering, refusal to accept defeat and the discovery of a hidden gift that gave her a new purpose.