Shoulder pain has a rhythm sufferers recognise: reaching up to a shelf or behind the seatbelt hurts, the arm aches into the evening after a day of use, and lying on that side at night is out of the question. By some estimates shoulder complaints are the third most common reason people seek musculoskeletal care. The majority involve the rotator cuff and the space it works in, the same structures covered in depth in the rotator cuff article, but the shoulder has a differential diagnosis worth one careful pass, because not all shoulder pain is cuff pain.
The patterns that sort it
Painful arc, night pain, gradual onset: rotator cuff-related pain leads. Pain reaching overhead and out to the side, a sore spot on the outer upper arm, weakness that is more “it hurts to try” than true loss of power.
Stiffness first, pain second: if the dominant problem is that the shoulder will not move, you cannot raise it or rotate it, and someone else moving it for you hits the same wall, think adhesive capsulitis (“frozen shoulder”). It behaves differently, runs a long self-limiting course of many months, and is managed with patience, pain relief, and mobility work dosed to its irritability. Diabetes is a risk factor.
Pain after a fall or injury, with true weakness: traumatic cuff tear or other structural injury, assessed promptly (see the rotator cuff and dislocation articles).
Deep pain with clicking and catching in a younger, active person: labral problems enter the picture.
Pain that is not really the shoulder: neck problems regularly refer pain into the shoulder and upper arm, and, the serious one to never miss, cardiac pain can present in the left shoulder and arm. Shoulder pain with exertion, chest pressure, breathlessness, or sweating is an emergency department presentation, not a physio one.
What treatment looks like for the common case
For rotator cuff-related pain, the evidence-backed core is education plus progressive exercise: gradually loading the cuff and shoulder blade muscles, restoring range, and modifying (not eliminating) the aggravating overhead work while capacity builds. Guideline syntheses for cuff disorders consistently place this conservative approach first, with injections a possible adjunct for pain relief in the short term and surgery reserved for specific structural problems or cases that fail a proper trial. Expect weeks to months, with steadiness beating intensity, shoulders in this state dislike heroic weekend efforts and reward boring consistency.
Practical things that help tonight
- Sleep on the other side with the sore arm supported on a pillow in front of you, or on your back with a small pillow under the elbow
- Keep the arm moving in its comfortable range daily, pendulums and assisted reaches, rather than guarding it completely still
- Spread overhead tasks through the day instead of doing them in one block
- Ice after aggravating activity if it soothes; heat before gentle movement if stiffness dominates
References
- Kukkonen J, Joukainen A, Lehtinen J, et al. Treatment of nontraumatic rotator cuff tears: a randomized controlled trial. Bone & Joint Journal. 2014;96-B:75–81.
- Blanpied PR, Gross AR, Elliott JM, et al. Neck Pain: Revision 2017: Clinical Practice Guidelines. Journal of Orthopaedic & Sports Physical Therapy. 2017;47(7):A1–A83. doi:10.2519/jospt.2017.0302 (relevant when the neck is the true source).
General information only, not medical advice. Shoulder pain with chest symptoms is an emergency; shoulder pain after trauma with weakness should be assessed promptly.