Joints are the structures that connect two or more bones in your body. They are found in the hips, the knees, the hands, and many other parts of the body.
Joints are surrounded and cushioned by soft tissues. Swelling occurs when fluid accumulates in these tissues. Joint pain, stiffness, or both may accompany the swelling. You may also notice that the joint appears bigger than normal, or that its shape is somewhat irregular.
While joint swelling can be a symptom of a chronic condition, it can also be a sign of an injury that requires medical attention.