The shoulder trades stability for range — it moves further than any other joint in the body, and it relies on muscle rather than bone to keep it stable. That is why it is both so useful and so easily upset.
What usually causes it
- Overhead work or sport — throwing, swimming, pressing, painting a ceiling. Repeated overhead load with insufficient control.
- Desk posture, which rounds the shoulders forward and narrows the space the tendons run through, so they get pinched on the way up.
- A stiff upper back. If the thoracic spine does not extend, the shoulder has to make up the difference and gets overworked.
- Sleeping on it night after night, which is often what turns a niggle into something that wakes you.
The neck connection
A great many “shoulder” problems are not in the shoulder. The upper trapezius and the muscles at the base of the neck refer pain straight into the shoulder and down the arm, which is why treating the sore spot often changes nothing. Assessment sorts out which one it is before anything is treated.
What treatment involves
Restoring the movement first — soft tissue work through the rotator cuff and the muscles around the shoulder blade, joint mobilisation if the joint itself has stiffened, and work on the upper back if that is limiting things.
Then strengthening. A shoulder that hurts is usually a shoulder that lacks control, and hands-on treatment alone will not hold without it.