What is frozen shoulder?
Frozen shoulder (adhesive capsulitis) is a condition where the capsule surrounding the shoulder joint — the fibrous sleeve that holds the joint fluid and allows smooth movement — becomes inflamed, thickens and gradually tightens, restricting movement in almost every direction rather than just one. Unlike impingement or rotator cuff tendinopathy, where pain is usually worse in specific positions (overhead reaching, lying on the shoulder), frozen shoulder typically restricts both active movement (what you can do yourself) and passive movement (what someone else can move your arm through) roughly equally — a distinguishing feature physiotherapists check for specifically, since it usually rules out a pure rotator cuff problem.
It most commonly affects adults between 40 and 60, is more common in women, and has a strong association with diabetes — roughly two to four times more likely, and often more prolonged and bilateral in that group — and, less commonly, thyroid disorders. Around half of cases have no clear trigger at all; the rest follow a period of reduced shoulder movement, whether from a minor injury, a period of immobilisation, or even unrelated surgery where the arm was kept still for an extended period.
The three stages of frozen shoulder
Frozen shoulder characteristically, though not always predictably, moves through three overlapping stages. The freezing stage brings gradually worsening pain, often disproportionate to how limited the movement looks at first, and can last anywhere from six weeks to nine months. The frozen stage is where pain usually settles somewhat but stiffness dominates — reaching, dressing and sleeping on that side become genuinely difficult — and this stage can last four to twelve months. The thawing stage sees movement gradually return, sometimes over several months, occasionally over a year or more.
Total duration varies hugely between people: some resolve within a year, others take two to three years, and a minority are left with some permanent restriction. This variability is exactly why physiotherapy input is about matching treatment to the current stage rather than following one fixed exercise sheet from day one — pushing hard into stretching during the acute freezing stage tends to aggravate pain without speeding recovery, while the same stretching is exactly what's needed once the frozen stage has settled into the thawing phase.
What an online physiotherapy assessment covers
A video assessment for suspected frozen shoulder checks the pattern of restriction across all planes of movement — forward reaching, reaching out to the side, and rotation with the elbow tucked in are the three most commonly affected and most useful to track over time. The physiotherapist also asks about the timeline, any relevant medical history (particularly diabetes or thyroid conditions), sleep disruption, and how symptoms compare side to side, since frozen shoulder is usually one-sided, though it can occasionally affect the other shoulder later.
Because a full physical examination with special provocation and resisted-strength tests is harder to replicate remotely than for some other shoulder conditions, an online assessment leans more heavily on guided active-movement demonstration — the physiotherapist talks you through specific movements on camera and compares range and quality side to side — alongside a detailed symptom history. Where the pattern doesn't fit typical frozen shoulder, or red flags are present, that's what triggers a referral for in-person examination or imaging rather than assuming.
Treatment: what actually helps at each stage
During the freezing stage, the priority is usually pain management and protecting the movement that's available, rather than aggressive stretching — gentle range-of-movement work within a comfortable limit, alongside advice on sleeping positions that reduce night pain (a common source of disrupted sleep), tends to help more than pushing into resistance. Some people are also referred for a corticosteroid injection during this stage, which a physiotherapist can help coordinate with a GP even as part of an online-led care pathway, though the exercise and education plan continues regardless of whether an injection is used.
Once the frozen stage settles and movement starts returning, a more structured, progressive stretching and strengthening programme becomes appropriate, moving from range-of-movement work toward reintroducing normal loaded tasks — reaching overhead, lifting, and eventually full-strength activity — over months rather than weeks. UK musculoskeletal guidance, including NICE, supports structured exercise therapy as first-line management throughout, with surgical options (manipulation under anaesthesia or arthroscopic capsular release) reserved for the minority of cases that don't progress despite a genuine trial of conservative treatment, typically considered after six to twelve months of limited improvement.
When to seek urgent or in-person care
Frozen shoulder itself is not an emergency, but a few presentations need ruling out before treating stiffness as straightforward adhesive capsulitis. Sudden, severe shoulder pain following a fall or direct trauma, a visibly deformed shoulder, or complete inability to move the arm following an injury needs same-day medical assessment to rule out a fracture or dislocation rather than physiotherapy. Shoulder pain accompanied by chest pain, breathlessness, sweating or pain spreading to the jaw or left arm needs emergency assessment to rule out a cardiac cause, particularly in anyone with cardiovascular risk factors. A hot, swollen joint with fever, or sudden genuine weakness rather than pain-limited weakness, should also be assessed urgently rather than assumed to be frozen shoulder.
A practical starting point
If you suspect frozen shoulder, a useful first step is tracking which specific movements are most limited — reaching behind your back, lifting your arm out to the side, and rotating your arm outward with your elbow tucked in are the three worth noting — and how each has changed over the past month. This pattern, more than pain intensity on any single day, is what helps a physiotherapist judge which stage you're in and how quickly things are moving. Avoid the temptation to either rest the arm completely or push hard into painful stretching; both tend to slow recovery compared with a staged plan matched to where you currently are.
This guide is part of PhysioOnClick's patient education library and is intended to support informed decisions, not replace an individual assessment. If shoulder stiffness and pain are worsening, disrupting sleep, or limiting daily tasks, a full online physiotherapy assessment is the safest next step to confirm the diagnosis and build a stage-appropriate plan.