Arthritis in the arm can cause pain, swelling, and stiffness in the elbow, shoulder, or wrists. It may affect one or more joints, depending on the type of arthritis a person has.
Pain between the shoulders is common: As many as one in 10 men and one in five women experience upper back pain, according to a 2015 journal article in Occupational Medicine. Often, upper back pain between the shoulders is caused by a muscle strain due to overuse, injury or poor posture, and although the resulting discomfort can range from mildly uncomfortable to severe and debilitating, the root cause can often be corrected with a combination of rest, stretching and exercise.
Biceps tendinitis is most often the result of everyday wear and tear on the muscle. In terms of sports, weightlifting is one of the high risk activities for biceps tendinitis, but this condition is a common sports injury that can happen to pros and amateurs alike.