Soft tissue rheumatism 4.Inflammatory arthritis. There are many different diseases in each of these groups. No one knows for sure what causes arthritis. Because there are so many different types, there are certainly many different causes. It may be that arthritis occurs only in people with a particular genetic, or inherited, susceptibility to it.
Research is ongoing to find out more about the causes of arthritis.
Swelling in one or more joints. Early morning stiffness. Recurring pain or tenderness in any joint. Inability to move a joint normally. Obvious redness and warmth in a joint.