Arthritis facts. 1  Arthritis is inflammation of one or more joints. 2  Symptoms of arthritis include pain and limited function of joints. 3  Arthritis sufferers include men and women, children and adults.4  A rheumatologist is a medical arthritis expert.rthritis facts. 1  Arthritis is inflammation of one or more joints. 2  Symptoms of arthritis include pain and limited function of joints. 3  Arthritis sufferers include men and women, children and adults. 4  A rheumatologist is a medical arthritis expert.