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.
Itâs an autoimmune condition, in which your immune system attacks healthy tissue in your joints and skin. This results in inflammation, causing joint swelling, pain, and stiffness. Septic arthritis. Joint swelling can also result from an infection in your joints, caused by bacteria, viruses, or fungi. This type of joint swelling is called septic arthritis.