Frozen shoulder: stages, treatment and recovery
Frozen shoulder, also called adhesive capsulitis, is a painful stiff shoulder where both active and passive movement become restricted, especially rotation. It is not the same as ordinary rotator cuff pain or "tight muscles". Most cases improve over time, but recovery can take many months to years, and the best treatment depends on the stage: calming pain early, preserving safe movement, then rebuilding range and strength as the shoulder thaws.12
Key facts
- NHS guidance says frozen shoulder causes shoulder pain and stiffness that can take months or years to get better.1
- The key examination clue is loss of passive shoulder movement, especially external rotation, not just pain when you use the arm.3
- Risk is higher with diabetes, thyroid disease, previous shoulder injury or surgery, and periods where the shoulder has been kept still.12
- Forceful stretching in the painful freezing stage can flare symptoms. Treatment should match irritability and stage, not follow a one-size programme.
- In the UK FROST trial of 503 secondary-care patients, early structured physiotherapy with steroid injection, manipulation under anaesthesia and arthroscopic capsular release had no clinically important difference in shoulder scores at 12 months.5
What frozen shoulder is
The shoulder joint is surrounded by a capsule. In frozen shoulder, that capsule becomes thickened, tight and painful, reducing the space available for movement. The medical name, adhesive capsulitis, points to the capsule rather than the rotator cuff tendons. That distinction matters because strengthening a painful tendon and treating a stiff capsule are not the same problem.
People often notice ordinary tasks becoming strangely hard: fastening a bra, tucking in a shirt, reaching a back pocket, putting on a coat, reaching the seatbelt, washing hair, sleeping on the side, or lifting the arm out to the side. Pain is often deep in the shoulder and can run down the upper arm. Night pain is common and can be the most miserable part.
The shoulder may feel "blocked" rather than merely painful. With rotator cuff pain, someone else can often move the arm further than you can move it yourself. With frozen shoulder, even passive movement is restricted. External rotation, such as turning the forearm outwards with the elbow by the side, is often particularly limited.3
The three stages
Frozen shoulder is often described in three overlapping stages. They are not exact calendar boxes, but they help explain why treatment needs to change over time. In the freezing stage, pain dominates and movement gradually tightens. In the frozen stage, pain may ease but stiffness is the main limitation. In the thawing stage, movement slowly returns.
| Stage | Typical pattern | Main priority |
|---|---|---|
| Freezing | Increasing pain, night pain, movement becoming restricted | Pain control, sleep, gentle movement, avoid aggressive forcing |
| Frozen | Less sharp pain for some, but marked stiffness and blocked range | Maintain function, gradual mobility, consider injection or hydrodilatation if appropriate |
| Thawing | Range slowly returns, strength and confidence lag behind | Progressive stretching, strengthening and return to normal loading |
InformedHealth notes that frozen shoulder can often improve on its own, but this may take one to three years.2 This natural history is important. It prevents panic, but it should not be used to dismiss pain, sleep loss or major disability. Waiting passively for two years is different from using the right support while time does part of the healing.
When it may be something else
Shoulder pain has many causes. Rotator cuff tendinopathy, subacromial pain, calcific tendinitis, arthritis, neck nerve pain, fracture, instability, polymyalgia rheumatica and referred pain can all confuse the picture. A label of frozen shoulder should be questioned if passive range is normal, pain came after a major injury, there is obvious deformity, or symptoms are mainly pins and needles, weakness or neck-related.
| Clue | Possible direction | Why it matters |
|---|---|---|
| Passive movement is nearly normal | Rotator cuff or subacromial pain more likely | Rehab and injection target may differ |
| Trauma, fall, deformity or inability to lift after injury | Fracture, dislocation, tendon tear | May need urgent imaging or orthopaedic review |
| Numbness, tingling, hand weakness or neck pain | Cervical nerve problem | Shoulder-only treatment may miss the driver |
| Both shoulders and hips painful with morning stiffness after age 50 | Polymyalgia rheumatica | Needs blood tests and prompt medical assessment |
| Chest pain, breathlessness, jaw pain, sweating or exertional symptoms | Heart-related referred pain | Emergency assessment if acute or concerning |
Also seek prompt review for fever, unexplained weight loss, cancer history, severe night pain that is not mechanical, redness, warmth, new neurological symptoms, or significant swelling. Frozen shoulder can be very painful at night, but red flags should not be waved away as "just adhesive capsulitis".
Tests and diagnosis
Frozen shoulder is mainly a clinical diagnosis. A clinician should compare both shoulders, looking at active movement, passive movement, rotation, pain location, neck contribution, strength and neurological signs. The hallmark is global restriction of passive glenohumeral motion, especially external rotation.3
Scans are not always needed at the start. X-ray may be used to rule out arthritis, fracture, dislocation or another bony cause. Ultrasound may be used if rotator cuff disease is suspected. MRI is usually reserved for atypical cases or when the diagnosis or treatment plan would change.
Risk-factor testing can matter. If someone has frozen shoulder without a clear trigger, asking about diabetes risk and thyroid symptoms is reasonable because both are associated with adhesive capsulitis. Diabetes can also make frozen shoulder more persistent and more likely to affect both shoulders over time.
Treatment options
In the painful freezing stage, the aim is to reduce pain enough to sleep and keep safe function. That may include simple pain relief where appropriate, heat or ice according to preference, activity modification, supported sleeping positions, avoiding repeated aggressive end-range stretching, and gentle range work within tolerable limits. NHS advice includes moving the shoulder gently and avoiding activities that make pain worse.1
Physiotherapy is useful when it matches the stage. Early on, it may be education, pain modification, gentle mobility and reassurance. Later, it may be progressive stretching, joint mobilisation, scapular control and strengthening. The Cochrane review of manual therapy and exercise included 32 trials and 1836 participants, but found uncertainty around many comparisons and noted that manual therapy and exercise may not be as effective as steroid injection in the short term for some outcomes.4
This does not mean physio is pointless. It means aggressive exercise is not automatically the best early treatment. The painful capsule may need calming before it can tolerate force. A good clinician should adjust the programme if every session leaves the shoulder flared for days.
Practical rule: if an exercise creates mild discomfort that settles quickly, it may be acceptable. If it triggers night pain or a multi-day flare, the dose is probably too high for the current stage.
Injections, hydrodilatation and surgery
Corticosteroid injection into the glenohumeral joint can reduce pain and improve function in the short term, especially earlier in the painful stage. It is not a permanent cure, but reducing pain can make sleep and gentle movement possible. People with diabetes need specific advice because steroid injections can raise blood glucose temporarily.
Hydrodilatation, also called distension, injects fluid into the joint capsule to stretch it, often with steroid and local anaesthetic. Cochrane evidence suggests distension with steroid and saline may improve pain and disability compared with placebo in the short term, but may not differ much from ordinary steroid injection in some comparisons.6 Local availability varies.
Surgery or manipulation under anaesthesia is usually considered only when symptoms are severe and persistent despite appropriate non-surgical care. In UK FROST, 503 adults with primary frozen shoulder in 35 UK hospitals were randomised to early structured physiotherapy with steroid injection, manipulation under anaesthesia with steroid injection and physiotherapy, or arthroscopic capsular release with manipulation and physiotherapy. At 12 months, differences in Oxford Shoulder Score were statistically detectable for some comparisons but below thresholds judged clinically important, and serious adverse events were rare but occurred mainly in surgical groups.5
The lesson is not "never have surgery". It is that surgery should be a shared decision for refractory cases, weighing pain, duration, disability, diabetes, work demands, risks, recovery time and access to good post-procedure physiotherapy. Early structured physiotherapy plus injection is a serious option, not a weak one.
The health library can help compare frozen shoulder with neck pain, rotator cuff symptoms, diabetes risk and inflammatory conditions. Use start here to prepare a concise symptom timeline, insights to assess treatment claims, and the stack builder if painkillers, anti-inflammatories, sleep aids or supplements are adding up.
- Does my passive shoulder range, especially external rotation, fit frozen shoulder?
- Do I need an X-ray, ultrasound, blood tests for diabetes or thyroid disease, or referral because the pattern is atypical?
- Am I in a painful freezing stage where injection and gentle movement may be more useful than aggressive stretching?
- Would physiotherapy, a guided steroid injection, hydrodilatation or specialist shoulder referral be appropriate?
- If I have diabetes, how should we manage blood glucose risk around steroid treatment?
References
- NHS, 2025. Frozen shoulder. link
- InformedHealth.org, 2022. Frozen shoulder. NCBI Bookshelf. link
- Le HV, Lee SJ, Nazarian A, Rodriguez EK, 2017. Adhesive capsulitis of the shoulder: review of pathophysiology and current clinical treatments. Shoulder and Elbow. link
- Page MJ, Green S, Kramer S, Johnston RV, McBain B, Chau M, et al, 2014. Manual therapy and exercise for adhesive capsulitis (frozen shoulder). Cochrane Database of Systematic Reviews. link
- Rangan A, Brealey S, Keding A, Corbacho B, Northgraves M, Kottam L, et al, 2020. Management of adults with primary frozen shoulder in secondary care (UK FROST): a multicentre, pragmatic, three-arm, superiority randomised clinical trial. Lancet. link
- Buchbinder R, Green S, Youd JM, Johnston RV, 2008. Arthrographic distension for adhesive capsulitis (frozen shoulder). Cochrane Database of Systematic Reviews. link
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This article is educational and does not constitute medical advice, diagnosis, or a treatment recommendation. Medication uses described as “off-label” are not licensed for that purpose in the UK and should only be considered under qualified clinical supervision. Always speak to your GP, pharmacist, or a registered specialist before starting, stopping, or changing any treatment. If you have severe or alarm symptoms - unintentional weight loss, blood in your stool, difficulty swallowing, persistent vomiting, a fever, or severe pain - seek urgent medical care.