Sedentary or static work, such as at a computer or with your arms above shoulder height, are common causes of shoulder problems.
The design of many keyboards often causes the upper arm to rotate outward. This puts the shoulder joint very close to its end range of motion and forces several muscles to work in a tense and maximally shortened position. As a result, both the shoulder joint and the muscles must work under very unfavorable conditions, leading to pain and stiffness.
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It is important to find a working position that is as relaxed and natural as possible. If your muscles tire quickly, you are likely sitting incorrectly. Another cause may be that the interaction between muscles and joints is not functioning satisfactorily due to prolonged, repetitive work. A naprapath will help you identify and address the root cause.
