Plain-language shoulder guide
AC joint and other causes of shoulder pain
Not all shoulder pain comes from the same place. Pain at the top of the shoulder may involve the AC joint, while neck, nerve, bone and other health problems can also produce symptoms around the shoulder or arm.
What you may notice
Symptoms can vary from person to person.
Pain focused at the top of the shoulder, sometimes worse when reaching across the body.
Pain and swelling after landing directly on the shoulder.
Neck pain, pins and needles, numbness or symptoms extending down the arm.
Pain that does not behave like a straightforward movement-related shoulder problem.
Making sense of it
What an assessment may consider.
The exact location, behaviour and onset of the symptoms.
Whether there was trauma and whether imaging is required.
Shoulder, neck and nerve-related examination where relevant.
Health symptoms that may suggest the pain is not primarily musculoskeletal.
The next step
What management may involve.
Advice and activity changes matched to the suspected cause.
Movement and strength work when appropriate for the presentation.
Medical review or imaging when trauma, neurological symptoms or other findings make it useful.
Urgent care when symptoms suggest a fracture, dislocation or medical emergency.
What current evidence suggests
A useful guide, with the uncertainty left in.
Last evidence review: July 2026
Pain directly over the top of the shoulder after a fall or impact may involve the acromioclavicular, or AC, joint.
Many lower-grade AC joint injuries are initially managed without surgery. Higher-grade injuries and ongoing major problems may need specialist review.
Some middle-grade injuries do not have one universally agreed treatment. Your work, sport, symptoms and preferences matter.
A visible deformity, severe loss of function, numbness, a high-energy injury or symptoms outside the shoulder should prompt timely assessment.
References
- Barnes CJ et al. Acromioclavicular joint injuries: multicentre expert consensus. 2025.
Level IV expert consensus supporting broad injury-grade guidance, not proof that one treatment is best.
- Xie C et al. Treatment of Rockwood type III AC joint dislocation. 2024.
Systematic review and meta-analysis focused on type III injuries, where treatment remains individualised.
- Ibounig T et al. AC joint and subacromial imaging abnormalities in asymptomatic shoulders. 2025.
Systematic review. Certainty was very low and prevalence varied substantially.
- Oldrini B et al. Clinical predictors of fracture in patients with shoulder dislocation. 2023.
Diagnostic systematic review supporting clinician assessment after trauma, not patient self-diagnosis.
A better conversation
Questions worth asking your health professional.
- Does this appear to come from the AC joint or somewhere else?
- Do the injury and examination suggest I need imaging?
- Are there neck or nerve signs we need to consider?
- Which changes would mean I should seek more urgent help?
When to get help
Some symptoms need prompt assessment.
Seek urgent medical help if shoulder or arm pain occurs with chest tightness, difficulty breathing or other symptoms that may suggest a medical emergency.
After an injury, an obvious deformity, inability to move the arm, marked weakness, severe swelling, or new numbness should be assessed promptly. If symptoms are worsening, persistent or worrying you, speak with a physiotherapist, GP or another qualified health professional.
Further reading
Useful information from established health organisations.
This page provides general education only. It cannot diagnose your shoulder or replace individual advice from a qualified health professional.
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