3. Tendonitis.
Tendonitis is a condition that occurs when the muscles and tendons that are connected to a joint become injured or inflamed (typically, injury leads to inflammation).
As a result of this inflammation, the joint that is affected can become very stiff and experience mild, moderate, or severe pain. It can also reduce mobility.
Like arthritis, tendonitis can affect any joint within the body, including the joints of the shoulder blades. If the rotator cuff, the top portion of the shoulder blade, is affected, it will place pressure on the soft tissues that lie underneath it, which will result in pain when you are lifting the arm up and away from the body.
Tendonitis can also affect the biceps, the large muscle within the upper part of the arm. It’s usually marked by pain when lifting. Rest, ice, and elevation are the treatments prescribed for tendonitis of the shoulder.