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.
Emotional and physical stress can contribute muscles to tense and spasm causing soreness and pain. Muscle tightness may also happen due to the stiffness of muscles which is due to the inflammation of the muscles or joints. Obesity, diabetes, infections, hormonal balances can also cause inflammation of muscles leading to stiffness.