Shoulder pain can stem from one or more of the following causes: 1  Strains from overexertion. 2  Tendonitis from overuse. 3  Shoulder joint instability. 4  Dislocation. Collar or upper arm bone fractures.  Frozen 1  shoulder. Pinched nerves (also called radiculopathy)
Joint pain can affect one or more joints. Joint pain can be caused by many types of injuries or conditions. It may be linked to arthritis, bursitis, and muscle pain. No matter what causes it, joint pain can be very bothersome. Some things that can cause joint pain are: Autoimmune diseases such as rheumatoid arthritis and lupus.
Joint stiffness can be caused by inflammation in the synovium, the lining of the joint. The abnormal synovial lining is the cause of many types of arthritis. The only physical expression of synovial involvement may be joint stiffness, but frequently pain, swelling, redness, and warmth also occur in the affected joint. Arthritis is not the only condition associated with joint stiffness. Other medical conditions can also cause joint stiffness, including bone diseases, cancer, joint trauma, or overuse of the joint.