Rheumatoid arthritis is difficult to diagnose while in its early stages because the early signs and symptoms of the disease are similar to other diseases. There is no one blood test or physical examination that can diagnose Rheumatoid arthritis. Rheumatoid arthritis is a problem with the immune system in the body. If the disease is not treated on time it can harm your joints. Since it is difficult to diagnose rheumatoid arthritis your family doctor may send you to a doctor who specialises in treating rheumatoid arthritis. Blood tests and X-rays are used to diagnose the disease.