Joints are the structures that connect two or more bones in your body. They’re found in your feet, ankles, knees, hips, arms, and many other parts of your body.
Joints are surrounded and cushioned by soft tissues. Swelling occurs when fluid accumulates in these tissues. Pain, stiffness, or both may accompany joint swelling. You may also notice that the affected joint appears bigger than normal or irregularly shaped.
Joint swelling can be a symptom of a chronic condition, such as arthritis, or an injury that requires medical attention, such as a dislocation.