Frozen shoulder has a way of creeping up on you. It often starts as an ache you can't quite explain, then over weeks and months the shoulder gets stiffer and stiffer, until reaching behind your back or up to a high shelf becomes a real struggle. It's frustrating and frequently painful — but understanding what's happening, and where you are in its course, makes the whole thing much easier to manage.
What is it?
Your shoulder sits inside a capsule of connective tissue that normally allows a huge range of movement — more than almost any other joint in the body. In frozen shoulder — known medically as adhesive capsulitis — that capsule becomes inflamed, thickened and tight, which is why the joint progressively loses movement in every direction (Kelley et al., 2013). It's the tightening and scarring of the capsule itself, rather than a muscle or tendon problem, that drives the stiffness, which is an important distinction from many other shoulder conditions where a rotator cuff tendon is the main issue.
One of its quirks, and one of the more reassuring things about it, is that it usually follows a predictable, if slow, path through recognisable stages and tends to resolve fully in time, even without surgery. Knowing that can be genuinely reassuring when you're in the thick of it and it feels as though the stiffness will never budge.
Why does it happen?
Often there's no obvious trigger at all, which can be one of the more frustrating aspects for people trying to make sense of why it happened to them. It's more common between the ages of 40 and 60, affects women somewhat more than men, and is strongly linked with conditions such as diabetes and thyroid problems — people with diabetes, in particular, have a notably higher lifetime risk and can experience a more prolonged course. It can also follow a period of not moving the arm much at all — for instance after another shoulder injury, a fracture elsewhere in the arm, or any surgery that involves a period of immobilisation.
That last point is a useful and practical reminder: a shoulder that stops moving normally, for whatever reason, is more vulnerable to stiffening up over the following weeks. This is part of why physiotherapists often encourage early, gentle movement after other shoulder or arm injuries where it's safe to do so, specifically to reduce the risk of a secondary frozen shoulder developing. Interestingly, the non-diabetic form of frozen shoulder tends to resolve somewhat faster and more completely than the form seen in people with diabetes, where the stiffness can be more persistent and the overall course somewhat longer, which is one reason blood sugar control is often discussed alongside shoulder-specific treatment in that group.
What does it feel like?
Frozen shoulder classically moves through three overlapping stages, and recognising which one you're in is genuinely central to getting the right treatment at the right time. In the freezing stage, which can last anywhere from a few weeks to several months, the shoulder is painful, often worst at night and when lying on the affected side, and gradually loses movement as the pain and guarding increase. In the frozen stage the pain may ease somewhat but the stiffness now dominates, making everyday tasks like reaching for a seatbelt, fastening a bra, or reaching a back pocket genuinely awkward. In the thawing stage, movement slowly and steadily returns, often over several months, sometimes longer.
A telltale sign that distinguishes frozen shoulder from many other shoulder problems is that both you and someone else moving your arm for you find the same limits — the restriction is coming from inside the joint itself, not just from your muscles guarding against pain. Loss of outward rotation, such as reaching your arm out to the side and rotating it away from your body, is usually the first and most marked movement to be affected, and remains a useful clinical marker throughout the condition's course.
Conditions that can look similar
Several other shoulder problems can be mistaken for frozen shoulder in the early stages. A rotator cuff tear or tendinopathy usually causes weakness and pain with specific movements, but without the same global, all-directions stiffness, and passive movement (someone else moving the arm for you) is typically much freer than active movement. Shoulder osteoarthritis can cause stiffness too, but tends to come with a grinding or grating sensation and is more common in people with a history of previous shoulder injury. Calcific tendinitis, caused by calcium deposits in a rotator cuff tendon, can cause a sudden, severe flare of shoulder pain that may initially look similar but usually settles over a shorter timeframe. And pain referred from the neck can mimic shoulder pain but doesn't typically come with the same true loss of shoulder joint movement. Because the right treatment differs quite a bit between these conditions, an accurate diagnosis early on is genuinely valuable. This is a helpful distinction to bear in mind, since neck-related pain generally comes with restricted neck movement reproducing the symptoms, rather than restricted shoulder joint movement itself.
How we assess it
The story and the pattern of movement usually tell us a great deal on their own. We'll measure how far the shoulder moves in each direction, both when you move it yourself and when we move it for you, and look specifically for the characteristic loss of outward rotation described above. We'll also check that it isn't one of the mimics discussed above, such as a rotator cuff problem or shoulder arthritis, because the treatment plans differ meaningfully between them. Identifying which of the three stages you're in is central to the assessment, because — as you'll see below — the right treatment in one stage can be the wrong treatment in another, and pushing too hard too early is one of the most common reasons people feel like their treatment isn't working.
How it's treated
Treatment is guided closely by which stage you're in (Kelley et al., 2013). In the painful freezing stage, the priority is calming symptoms and keeping the shoulder gently moving within a comfortable range — gentle pendulum-style exercises, pain relief strategies, and light hands-on techniques aimed at reducing irritability rather than forcing range. Pushing hard into stiff, painful range during this stage tends to backfire, stirring up more pain and guarding rather than helping the shoulder move more freely.
As you move into the frozen and thawing stages, when the shoulder is generally less irritable and pain has settled somewhat, we can afford to be more assertive: firmer joint mobilisation techniques and progressive, sustained stretching to gradually win back range, supported by strengthening exercises as movement returns and the muscles around the shoulder need to catch up with the newly regained mobility. Where symptoms are severe, particularly painful, or slow to budge despite appropriate treatment, a GP or specialist may discuss additional options such as a corticosteroid injection into the joint, which can meaningfully reduce pain and sometimes accelerate progress through the freezing stage (Neviaser and Hannafin, 2010). In a small number of prolonged, treatment-resistant cases, procedures such as hydrodilatation or manipulation under anaesthesia may be considered by a specialist, though most people recover well without needing to reach that point.
The honest timeline here is a long one — frozen shoulder can take many months, sometimes well over a year from start to finish, to fully resolve, and this is one of the more important things to understand from the outset. Good treatment doesn't magically switch that timeline off or dramatically shorten it in every case, but it keeps you as comfortable as possible along the way, protects the movement you do have, and helps you regain range as quickly and as fully as the shoulder's own healing process will allow at each stage.
How the three stages differ in practice
It's worth spelling out roughly how long each stage tends to last, while remembering that every person's timeline is somewhat different. The freezing stage typically lasts two to nine months and is usually the most painful, particularly at night. The frozen stage, where stiffness is at its worst but pain has often settled to a more manageable background level, typically lasts four to twelve months. The thawing stage, during which movement gradually returns, can take anywhere from five months to two years. Added together, a full episode of frozen shoulder commonly runs somewhere between one and three years from start to finish, though many people notice meaningful, functional improvement well before the shoulder is fully back to normal.
This long overall timeline is precisely why staged, patient management matters so much. Treating the freezing stage as though it were the thawing stage — pushing hard for range while the joint is still highly irritable — is one of the most common reasons people feel their physiotherapy “isn't working,” when in fact the treatment simply needs to match where the shoulder currently is in its own natural course.
What you can do yourself
Keep the shoulder moving gently and often, within a range that doesn't provoke sharp pain — pendular swings, where you lean forward and let the arm hang and gently swing, and easy assisted movements using your other arm or a stick, are ideal in the early, irritable stage. Applying warmth to the shoulder before exercise can help the tissues feel more comfortable to move. Above all, resist the temptation to force the arm through pain in the belief that you're “breaking it free” — in the irritable freezing stage, this approach usually makes matters worse rather than better, and is one of the most common self-management mistakes we see.
It also helps simply to know and trust the natural course of this condition. This is a condition that reliably gets better with time and appropriate care, and matching your effort and the intensity of your exercises to the stage you're actually in — rather than the stage you wish you were in — is the fastest and least painful way through it. Recovery is rarely perfectly linear, and small setbacks after a busy or awkward day are common and not a sign of regression.
When to seek help
It's worth being assessed early, both to confirm the diagnosis with confidence and to make sure your management fits the specific stage you're in from the outset, rather than trying a generic approach. Seek prompt review if the shoulder pain followed a significant injury or fall rather than developing gradually, or if you have unexplained night pain accompanied by feeling generally unwell, fever, or weight loss, as these features need to be checked further and are not typical of straightforward frozen shoulder.
Frequently asked questions
Will my frozen shoulder come back once it resolves? It's uncommon for frozen shoulder to recur in the same shoulder once it has fully resolved, though there is a modestly increased chance of it developing in the other shoulder at some point, particularly in people with diabetes.
Do I need an X-ray or scan? Not usually to diagnose frozen shoulder itself, as the diagnosis is typically made clinically from the pattern of stiffness. Imaging is sometimes used to rule out other conditions, such as arthritis or a rotator cuff tear, if the picture is unclear.
Is surgery ever needed? Only in a small minority of cases that don't respond adequately to conservative treatment and injections over an extended period. Most people recover full or near-full movement without ever needing a surgical procedure.
At BPR we'll work out exactly where you are in the process and tailor your treatment accordingly — easing pain and protecting movement when the shoulder is irritable, and actively restoring movement and strength when it's ready for that stage. You can book an assessment at bpr.rehab.
References
Kelley, M.J., Shaffer, M.A., Kuhn, J.E. et al. (2013) 'Shoulder pain and mobility deficits: adhesive capsulitis', Journal of Orthopaedic & Sports Physical Therapy, 43(5), pp. A1–A31.
Neviaser, A.S. and Hannafin, J.A. (2010) 'Adhesive capsulitis: a review of current treatment', American Journal of Sports Medicine, 38(11), pp. 2346–2356.