It’s the middle of a busy shift when you walk into the room and find your patient cradling their shoulder, equal parts uncomfortable and frustrated. There’s no trauma, no clear inciting event, just a story that starts with mild pain a few weeks ago and has quietly progressed to the point where they can’t reach overhead, can’t get dressed without help, and can’t quite understand what went wrong. You run through the usual differential — fracture, dislocation, septic joint, even cardiac causes — but everything checks out. This is where frozen shoulder, aka adhesive capsulitis, quietly lives in our differential. And for many of us in emergency medicine, it’s a diagnosis we know of… but don’t always feel confident naming. Let’s change that.
What Frozen Shoulder Actually Is
Frozen shoulder goes beyond stiffness. It’s a progressive, inflammatory condition where the joint capsule becomes thickened, fibrotic, and tight. This results in painful restriction of both active and passive range of motion. That last part matters. If the patient can’t move it and you can’t move it either, you’re no longer thinking about the rotator cuff alone. That’s your clue. Patients often describe a slow, sneaky onset. At first, it’s just pain. Then, one day, they realize they can’t reach overhead, fasten a bra, or grab something from the back seat. It is often described as having three phases:
- Freezing (painful phase): Increasing pain, decreasing motion (2–4 months)
- Frozen (stiff phase): Less pain, but significant stiffness (6–12 months)
- Thawing (recovery): Gradual return of motion (months)
Who Gets It? (Hint: Not Your 25-Year-Old Gym Rat)
Frozen shoulder tends to show up in patients in their 50s and 60s, with a higher prevalence in women. And if your patient has diabetes, your index of suspicion should go way up — there’s about a threefold increased risk. Other common associations include thyroid disease, hyperlipidemia, obesity, and recent immobilization (injury, surgery, or even just a sling that overstayed its welcome)
That last one is worth pausing on. Immobilization doesn’t just worsen frozen shoulder but notably contribute to causing it. So if you’re reaching for a sling for comfort, it’s worth asking: Am I helping… or setting them up for months of stiffness?
Our Job in the ED
Here’s the good news: you don’t need an MRI, a specialist consult, or a perfect orthopedic exam to make a meaningful difference.
Your job is threefold:
- First: Rule Out the Bad Stuff. Even though it wasn’t trauma, it’s still not crazy to get an X-ray. Normal? Great. That’s expected here. Imaging is mainly to exclude fracture, dislocation, or significant contributory arthritis, not to confirm frozen shoulder.
- Second: Name it. While I normally caution against assigning a diagnosis without a confirmatory diagnostic test, it’s helpful for the patient to assign a suspected culprit. Saying, “This could be a frozen shoulder” gives the patient a roadmap of what to do, who to see, and a timeline of recovery.
- Third: Get the patient moving. The cornerstone of treatment is movement.
Encourage gentle daily stretching, early referral to physical therapy, and NSAIDs for pain (if appropriate). Simple exercises — like pendulum swings or “wall walking” — can be lifesavers while they wait for PT. And avoid the sling, even if the patient begs for it! More immobilization can lead to more freezing of this already frozen shoulder.
By suspecting adhesive capsulitis in your next patient with atraumatic shoulder pain, you can genuinely change the trajectory of someone’s next year by getting them moving with the right exercises and headed in the right direction with consultants in follow-up. As we well know, sometimes the most meaningful thing we do in the ED isn’t directly fixing the problem, but getting them the right help they need.
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