Key points
- Pain reaching overhead with movement still available usually points to the rotator cuff.
- Movement that is genuinely blocked in every direction, including when someone else moves your arm, points to frozen shoulder.
- Night pain that wakes you when you roll onto the shoulder is common and is worth mentioning at the assessment.
- Rotator cuff tears are found on scans in many people with no pain at all.
- Frozen shoulder is measured in months, not weeks, and that is normal rather than a sign of failure.
Three different problems that feel similar
Rotator cuff related pain is the most common. It hurts when you reach, lift or rotate, often in a specific arc of movement, and the shoulder still moves through most of its range if you push through. It responds well to loading.
Frozen shoulder is different in a way that is easy to test: the movement is not just painful, it is unavailable, including when someone else moves your arm for you. It has a predictable course of a painful phase, a stiff phase and a thawing phase, and it takes many months.
The third group is movement related: the shoulder blade does not move the way it should, so the ball and socket run out of room. Nothing is damaged, and it responds to changing the pattern rather than to rest.
What the assessment is looking for
Whether the range is limited by pain or genuinely blocked. How the shoulder blade moves as you lift. Which specific tests reproduce your familiar pain. Strength in each direction of rotation. And whether the neck reproduces the symptoms, because a proportion of shoulder pain comes from there.
That combination separates the three groups above reliably, which is why it is worth more than starting with imaging.
Why a scan can mislead you
Rotator cuff tears appear on imaging in a substantial proportion of people who have no shoulder pain whatsoever, and the proportion rises sharply with age. A tear on a scan does not establish that the tear is your problem.
That matters because many partial tears do very well with loading and never need repair. Being told you have a tear, and concluding you must not load the shoulder, is a common route to a stiff, weak shoulder that hurts more.
Treatment by type
For rotator cuff pain: progressive loading of the cuff and the muscles around the shoulder blade, over three months or so, with hands-on work early to make it tolerable. This is well supported and it works, but it is not quick.
For frozen shoulder: pain control and gentle movement in the painful phase, then sustained stretching and mobilisation in the stiff phase. Aggressive stretching early in the painful phase makes it worse, which is the most common mistake.
For movement related pain: retraining how the shoulder blade and trunk contribute to reaching, plus strengthening what is not pulling its weight. Often the fastest of the three to change.