Diseases & care
Frozen shoulder explained: causes, stages and recovery
Frozen shoulder, known medically as adhesive capsulitis, is a common and often bewildering cause of shoulder pain and stiffness. It can make everyday tasks — reaching for a seatbelt, fastening a bra, or putting on a coat — surprisingly difficult and painful. The good news is that although it can last a long time, frozen shoulder usually gets better on its own, and simple treatments can ease the journey. This guide explains, in plain terms, what happens inside the shoulder, who tends to get it, how it moves through predictable stages, and what helps at each one.
Education and reference only. This article explains how treatments work in plain language — it contains no doses and is not a substitute for advice from your doctor or pharmacist. Always discuss your own treatment with a qualified clinician.
What frozen shoulder is
The shoulder is a ball-and-socket joint wrapped in a stretchy bag of tissue called the capsule. In frozen shoulder, this capsule becomes inflamed, thickened and tight, and bands of scar-like tissue form. The capsule effectively shrinks and grips the joint, which is why the shoulder both hurts and refuses to move — not because of a problem in the muscles, but because the joint's own lining has stiffened. A telling feature is loss of movement in all directions, including when someone else tries to move your arm for you. This "can't move it even when helped" pattern is what separates a frozen shoulder from many other shoulder problems.
Who gets it and why
Frozen shoulder most often affects people between 40 and 60, and is more common in women. Its exact cause is not fully understood, but some things make it more likely. Diabetes is a strong risk factor, and the condition can be more stubborn in people who have it. It can also follow a period when the arm has been kept still — after an injury, surgery or a stroke — or appear with no obvious trigger at all. Thyroid problems and some heart or lung conditions are also linked. Usually only one shoulder is affected at a time, though the other can be involved later. Knowing the risk factors helps explain why it happened, even when it seems to come from nowhere.
The three stages
Frozen shoulder typically moves through three overlapping phases, which is why patience is part of the treatment. The first is the freezing or painful stage, lasting weeks to months, when pain builds and gradually limits movement, often worse at night. The second is the frozen or stiff stage, where pain may ease but stiffness dominates and everyday reaching becomes hard. The third is the thawing stage, when movement slowly returns and the shoulder gradually loosens. The whole process can take one to three years, though many people recover sooner. Understanding which stage you are in helps set realistic expectations and choose the right treatment — pushing hard through the painful stage tends to backfire.
How it is treated
Treatment aims to control pain and keep the shoulder moving as much as comfort allows. In the early painful stage, simple pain relief, gentle movement within a comfortable range, and avoiding positions that flare it up are the mainstays; heat can soothe. Physiotherapy is central, with a graded stretching and mobility programme tailored to the stage — gentle early on, more assertive as pain settles. If pain is severe or progress stalls, a steroid injection into the joint can reduce inflammation and help physiotherapy. A minority who remain very stiff after other measures may be offered a procedure to release the tight capsule. Most people recover well without surgery.
Living with it and when to seek help
Frozen shoulder is frustrating because recovery is slow and not always steady, but knowing it is self-limiting helps. Keeping gently active, doing prescribed exercises regularly, and managing pain so you can sleep all make a difference. Managing diabetes well may help recovery. See your GP if shoulder pain and stiffness are steadily worsening, disturbing your sleep, or stopping you doing daily tasks, so the diagnosis can be confirmed and treatment started. Seek prompt medical advice if shoulder problems follow a significant injury, if the arm looks deformed, or if there is fever, redness and warmth over the joint, as these suggest a different problem needing urgent attention.
In short
Key takeaways
- Frozen shoulder is a thickening and tightening of the shoulder joint's lining, causing pain and stiffness.
- A key sign is loss of movement in all directions, even when someone else moves your arm.
- It usually passes through freezing, frozen and thawing stages over one to three years.
- Physiotherapy, pain relief and sometimes a steroid injection are the mainstays; surgery is rarely needed.
- This is general information, not a diagnosis — see your GP if shoulder pain and stiffness are worsening or disturbing sleep.
Answers
Frequently asked questions
How long does a frozen shoulder last?
It varies, but the whole process often takes between one and three years as it moves through the painful, stiff and thawing stages. Many people recover sooner, especially with physiotherapy and good pain control. It usually improves on its own eventually, even if progress feels slow.
Should I keep using my arm or rest it?
Gentle movement within a comfortable range is encouraged — completely resting the arm can make stiffness worse. In the painful early stage, avoid forcing movements that flare the pain, but keep doing the gentle exercises your physiotherapist recommends. As pain settles, stretching can gradually become more assertive.
Will I need surgery?
Most people do not. The great majority recover with pain relief, physiotherapy and sometimes a steroid injection. Surgery or a procedure to release the tight capsule is only considered for the minority who stay very stiff and are not improving after other treatments have been tried.
Go deeper
Related guides
Sources
Where this is drawn from
- NICE Clinical Knowledge Summaries: Shoulder pain
- Chartered Society of Physiotherapy — Frozen shoulder: information and exercises
- British Elbow and Shoulder Society — Frozen shoulder patient guidance
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