Joints connect bones and allow movement in different planes of motion. A fibrous capsule that contains ligaments, joint fluids, and cartilage, which cushions the movement between the bones, surrounds each joint. Tendons, which connect muscles to bones, usually attach near a joint. Pain can arise from any of these structures.
Causes of joint pain include episodes of unusual activity, trauma, disease, degeneration, and inflammation. The pain can vary in intensity, from mild soreness to debilitating pain. Some pathologies result in systemic joint pain, effecting more than one joint.