Frozen Shoulder

Introduction

If your shoulder has slowly become painful and stiff — making it hard to reach behind your back, lift your arm overhead, fasten a bra, or sleep on that side — you may be dealing with frozen shoulder. The condition can feel alarming because the stiffness builds gradually and does not respond to the usual rest-and-stretch advice that helps other shoulder problems.

Frozen shoulder, known medically as adhesive capsulitis, is a well-recognised condition with a fairly predictable pattern. The good news is that most people improve with non-surgical care. The challenging part is that recovery is usually slow, often measured in months rather than weeks, and the journey through the condition has distinct stages.

This guide explains what frozen shoulder is, why it develops, how doctors diagnose it, the full range of treatment options from physiotherapy through to surgery, what recovery typically looks like, and how to protect the shoulder over the long term. It is written for someone who already has the diagnosis or strongly suspects it, and who is now planning the next phase of care.

What Is Frozen Shoulder?

The shoulder is a ball-and-socket joint. The ball is the rounded top of the upper arm bone (the humerus), and the socket is a shallow part of the shoulder blade (the glenoid). Holding the joint together is a flexible sleeve of tissue called the joint capsule, which normally stretches easily to allow the wide range of movement the shoulder is famous for.

In frozen shoulder, this capsule becomes inflamed, thickened, and contracted. Bands of scar-like tissue (called adhesions) can form inside it. The capsule loses its stretch, and as a result the shoulder loses its range of motion in every direction — not just one. This pattern of stiffness in all directions, including when someone else tries to move your arm for you (so-called passive movement), is the hallmark that distinguishes frozen shoulder from other shoulder problems such as rotator cuff tears or impingement.

The Three Stages of Frozen Shoulder

1. Freezing (painful) stage. This is the most uncomfortable phase. Pain comes on gradually and worsens over weeks to months. Night pain is common, and movement becomes more limited as the capsule tightens. This stage typically lasts from a few weeks up to around nine months.
2. Frozen (stiff) stage. Pain often eases somewhat, but stiffness dominates. Daily tasks such as reaching for a seat belt, washing your hair, or putting on a jacket become difficult. This stage commonly lasts four to twelve months.
3. Thawing (recovery) stage. Motion gradually returns. Strength rebuilds slowly. This stage can take six months to two years.

In total, the condition often runs its full course over one to three years. Some people recover sooner, and a smaller group are left with some lasting stiffness. Treatment aims to reduce pain, speed up the return of motion, and prevent the long-term loss of function.

How Common Is Frozen Shoulder?

Frozen shoulder most often affects adults between the ages of 40 and 60. Women are affected somewhat more often than men. The non-dominant shoulder is involved at least as often as the dominant one, and around one in five people who have had frozen shoulder on one side eventually develop it in the other shoulder — though usually not at the same time.

Types of Frozen Shoulder

Doctors generally divide frozen shoulder into two categories based on what triggered it.

Primary (Idiopathic) Frozen Shoulder

“Primary” or “idiopathic” means the condition arises on its own, without a clear injury or trigger. The shoulder simply starts to hurt and stiffen. This is the most common form, and it is strongly associated with certain medical conditions, particularly diabetes and thyroid disease.

Secondary Frozen Shoulder

Secondary frozen shoulder follows a clear event — an injury, a fracture, shoulder or breast surgery, or a period when the arm was kept still in a sling for another reason. Inflammation and immobility together set the stage for the capsule to tighten. Frozen shoulder has also been reported after stroke, when the affected arm cannot be moved normally.

The treatment principles are similar for both forms, but secondary cases sometimes need additional attention to the underlying problem (for example, a rotator cuff tear that contributed to immobility).

Causes and Risk Factors

The exact reason the capsule becomes inflamed in primary frozen shoulder is not fully understood. Research points to a low-grade inflammatory process combined with the formation of fibrous tissue inside the capsule. Several risk factors are well established.

Strong Associations

• Diabetes. People with diabetes have a much higher lifetime risk of frozen shoulder, and their cases tend to be more stubborn and slower to resolve. Both type 1 and type 2 diabetes are associated.
• Thyroid disease. Both an underactive and an overactive thyroid have been linked.
• Age 40 to 60. Frozen shoulder is unusual outside this age range.
• Female sex. Women are affected more often than men.

Other Contributing Factors

• Prolonged immobilisation of the arm (after fracture, surgery, or stroke)
• Previous shoulder surgery, including breast surgery on the same side
• Parkinson’s disease and other neurological conditions
• Cardiovascular disease
• Dupuytren’s contracture (a hand condition that involves a similar pattern of fibrous tissue formation)

If you have one of these risk factors and develop shoulder pain and stiffness, frozen shoulder is high on the list of possibilities your doctor will consider.

Signs and Symptoms to Recognise

If you already have the diagnosis, the symptoms below may match what you have been experiencing. They can also help you and your doctor track which stage you are in.

• Pain that builds gradually over weeks to months, often without a specific injury
• A deep ache in the outer shoulder and upper arm, sometimes spreading toward the elbow
• Pain that is worse at night and disturbs sleep, particularly when lying on the affected side
• Stiffness in all directions — reaching overhead, behind your back, and out to the side all become difficult
• Difficulty with simple daily tasks such as dressing, grooming, fastening a seat belt, or reaching into a back pocket
• Loss of movement that does not improve when someone else tries to gently move your arm for you

That last point is important. In many shoulder conditions, the arm moves more easily when relaxed and helped by another person. In frozen shoulder, both active movement (you doing it) and passive movement (someone else doing it) are limited. This pattern, picked up on examination, is one of the strongest clues to the diagnosis.

How Frozen Shoulder Is Diagnosed

Frozen shoulder is largely a clinical diagnosis, meaning it is made through your history and physical examination rather than from a scan.

The Clinical Examination

Your doctor will ask about when symptoms began, what makes them better or worse, sleep disturbance, your medical history (especially diabetes and thyroid disease), and any prior shoulder problems or injuries. They will then examine both shoulders, comparing them side by side. Key findings that support frozen shoulder include:

• Loss of motion in multiple directions, particularly external rotation (turning the arm outward with the elbow at your side)
• Equal loss of motion whether you move the arm yourself or the doctor moves it for you
• Pain at the extremes of movement

Imaging

Imaging is used to rule out other conditions rather than to confirm frozen shoulder itself.

• X-ray. Usually normal in frozen shoulder. It is requested to exclude arthritis of the shoulder, calcium deposits, or evidence of an old fracture.
• Ultrasound. Can help assess the rotator cuff and biceps tendon, and may show some thickening of the capsule.
• MRI. Not always needed. It is used when the diagnosis is uncertain or when a coexisting problem such as a rotator cuff tear is suspected. MRI may show thickening of the capsule and inflammation in the surrounding tissue.

Blood Tests

Your doctor may check blood sugar (HbA1c) and thyroid function if these have not been measured recently, because uncontrolled diabetes or thyroid disease can both contribute to the condition and slow recovery.

Treatment and Management

Treatment is tiered. Most people start with non-surgical care, and the majority improve without ever needing surgery. The American Academy of Orthopaedic Surgeons and other major orthopaedic bodies describe a stepwise approach, beginning with simple measures and escalating only if needed.

An important principle is that the treatment is tailored to the stage of the condition. Pushing aggressive stretching during the painful freezing stage often makes pain worse without speeding recovery. Gentler care during that phase, with more active rehabilitation later, tends to be more comfortable and at least as effective.

Pain Relief Medications

Simple painkillers such as paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs) are commonly used in the freezing stage to manage pain and help with sleep. Doctors prescribe these short-term, taking into account stomach, kidney, and heart factors.

Physiotherapy

Physiotherapy is central to most frozen shoulder treatment plans. A physiotherapist with experience in shoulder conditions will guide you through:

• Range-of-motion exercises — gentle stretches such as pendulum swings, wall climbs, and assisted stretches that gradually restore motion
• Joint mobilisation — hands-on techniques applied by the physiotherapist to ease capsule restriction
• Heat application before exercise to relax the tissues
• Postural and scapular exercises to support normal shoulder mechanics as motion returns
• Strengthening work, introduced later as pain eases and motion improves

The intensity of physiotherapy should match the stage. In the painful freezing stage, gentle and pain-respecting stretches are favoured. As the shoulder moves into the frozen and thawing stages, more active stretching and strengthening become possible.

Corticosteroid Injections

An injection of corticosteroid (a strong anti-inflammatory medicine) into the shoulder joint can reduce pain and inflammation, particularly in the freezing stage. Some are given by feel (using anatomical landmarks), while others are guided by ultrasound for accuracy. Evidence suggests that combining a steroid injection with a structured physiotherapy programme gives better short-term results than either alone.

Doctors usually limit the number of injections (often no more than two or three to the same shoulder per year) because of concerns about effects on cartilage and tendons with repeated use. People with diabetes should be aware that steroid injections can raise blood sugar for several days afterward.

Hydrodilatation (Capsular Distension)

In hydrodilatation, the radiologist or surgeon injects a larger volume of fluid — usually saline mixed with a steroid and local anaesthetic — into the joint under image guidance. The fluid stretches the tight capsule from the inside. For some patients, this combines pain relief with an improvement in motion. It is one of the options doctors may consider when standard injections and physiotherapy are not progressing the shoulder forward.

Surgical Options

Surgery is considered when symptoms remain severe and disabling after a sustained trial of non-surgical care — typically several months of physiotherapy combined with injections. It is not the first step, and many patients improve enough that surgery is never needed. When it is offered, the two main options are manipulation under anaesthesia and arthroscopic capsular release. They are sometimes combined.

Manipulation Under Anaesthesia (MUA)

In this procedure, you are given a general anaesthetic so that your muscles fully relax. The surgeon then carefully moves the shoulder through a controlled range of motions to stretch and break up the tight capsule. The procedure itself is brief. Physiotherapy starts very soon afterward, often the same day, to maintain the motion that has been gained.

Possible drawbacks include a small risk of fracture (particularly in older patients or those with thin bones), tendon injury, or temporary nerve irritation. Many surgeons now combine MUA with arthroscopic release rather than performing it alone.

Arthroscopic Capsular Release

The operation typically takes 30 to 60 minutes. It is often performed as a day-case procedure. As with MUA, physiotherapy starts immediately to preserve the motion that has been gained. Arthroscopic release is particularly considered when the capsule is very thickened, when previous less-invasive treatments have not worked, or in patients with diabetes whose frozen shoulder is often more resistant.

Open Surgery

Open release, in which the surgeon accesses the capsule through a larger incision, is rarely needed today. It may still be considered in unusual situations, such as severe scarring after previous open shoulder surgery.

Recovery After Treatment

Recovery looks different depending on whether you have been managed non-surgically or have had a procedure.

Recovery With Non-Surgical Treatment

Improvement is gradual. Most people notice some pain relief within a few weeks of starting treatment, especially after a steroid injection or hydrodilatation. Return of motion is slower — weeks to months — and full recovery often takes one to two years overall when the condition is allowed to run its natural course alongside physiotherapy.

Continuing the home exercise programme between physiotherapy visits is central to progress. Skipping exercises is one of the most common reasons people feel they are not improving.

Recovery After Manipulation or Arthroscopic Release

• Day of surgery to first week. Pain control with medication, ice, and a sling for comfort (not for immobilisation). Gentle physiotherapy exercises begin almost immediately.
• First 6 weeks. Intensive physiotherapy several times a week, with daily home exercises. Most people see meaningful gains in motion during this period.
• 3 months. Significant improvement in range of motion is usually evident. Strengthening exercises become more prominent.
• 6 to 12 months. Continued gradual improvement in strength and endurance. Many patients return to most or all activities.

Return to work depends on the demands of the job. Desk-based work is often possible within a few days to two weeks. Jobs that involve heavy lifting or overhead work may need six weeks or longer before full duties are resumed.

What Affects Recovery Speed

• How well diabetes or thyroid disease is controlled
• Consistency with home exercises
• How long the shoulder had been frozen before treatment
• Whether both shoulders are affected
• Age and general health

Risks and Complications

Frozen shoulder itself is not a dangerous condition, but it can leave lasting limitations if not addressed. Risks vary by treatment.

Risks of Non-Surgical Treatment

• Side effects of NSAIDs (stomach irritation, kidney effects, blood pressure changes)
• Temporary rise in blood sugar after steroid injection, especially in diabetes
• Skin discolouration or thinning at the injection site (uncommon)
• A small risk of joint infection with any injection
• Persistent stiffness if treatment is delayed or inconsistent

Risks of Manipulation Under Anaesthesia

• Fracture of the upper arm bone (rare but more likely in older patients or those with osteoporosis)
• Tendon injury, including rotator cuff tear
• Temporary nerve injury
• Anaesthetic risks

Risks of Arthroscopic Capsular Release

• Infection (uncommon)
• Nerve injury, particularly to the axillary nerve, which can cause numbness or weakness (uncommon)
• Bleeding into the joint
• Recurrence of stiffness
• Anaesthetic risks

Across all surgical options, the most common disappointment is incomplete recovery of motion, usually linked to insufficient physiotherapy afterward or to a particularly resistant capsule (more often in long-standing diabetes).

Living with Frozen Shoulder

Day-to-day life with frozen shoulder can be wearing, particularly during the painful freezing stage. Some practical adjustments can make the journey easier.

Sleep

Night pain is one of the most common complaints. Strategies that help include:

• Sleeping on the unaffected side with a pillow under the affected arm to support it
• Using a small folded towel or pillow to fill the gap under the affected shoulder when lying on your back
• Taking pain medication, if prescribed, about 30 minutes before bed
• Avoiding sleeping with the affected arm overhead

Daily Activities

• Switch to front-fastening clothes during the worst stiffness
• Move toiletries and frequently used items to waist or chest height
• Use the unaffected arm to lift, carry, and reach where possible — without becoming so over-protective that the shoulder stops moving altogether
• Apply heat before exercises and ice afterward if soreness flares

Exercise and Activity

Continuing to move the shoulder is important, even when it hurts. Complete rest tends to worsen stiffness. At the same time, pushing into severe pain is counterproductive. The general rule guided by physiotherapists is to stretch into mild-to-moderate discomfort but to back off from sharp or worsening pain.

Emotional Impact

A condition that lasts one to three years, disturbs sleep, and limits independence can affect mood. This is a recognised part of the experience for many patients, not a sign that something else is wrong. Talking openly with your doctor about how you are coping, and staying connected with usual activities where possible, both help.

Monitoring and Follow-Up

Follow-up varies with the stage and the treatment plan. Typical patterns include:

• Review with the orthopaedic surgeon or physiotherapist every 4 to 8 weeks during active treatment
• Range-of-motion measurements at each visit to track progress objectively
• Reassessment if pain or stiffness fails to improve as expected, including consideration of imaging or escalation of treatment
• Periodic blood sugar checks if diabetes is present, since better control improves outcomes

If you have had surgery, follow-up usually includes a wound check within the first two weeks, then progress reviews at 6 weeks, 3 months, and as needed beyond that.

Preventing Recurrence and the Other Shoulder

Once frozen shoulder has fully resolved, it rarely returns to the same shoulder. However, the opposite shoulder has a higher chance of being affected at some point. There is no proven way to prevent the condition entirely, but the following steps support shoulder health and may reduce the risk and severity if it does occur.

• Keep both shoulders moving through their full range several times a week with stretches your physiotherapist has shown you
• Manage diabetes and thyroid conditions closely, as good control is consistently linked with better shoulder outcomes
• Avoid prolonged immobilisation after an injury or operation; ask early about safe gentle movement
• Address shoulder pain early rather than waiting for stiffness to set in
• Maintain general fitness, with attention to posture and the muscles around the shoulder blade

When to Seek Medical Attention

Most of the time, frozen shoulder is uncomfortable but not urgent. Contact your doctor sooner rather than later if you notice any of the following:

• A sudden, marked worsening of pain after a fall or injury
• Fever, redness, or swelling around the shoulder, particularly after an injection or surgery
• New numbness, tingling, or weakness in the arm or hand
• Pain that radiates into the chest, or chest tightness — this should be treated as an emergency, as shoulder and arm pain can occasionally signal a heart problem
• No improvement after several months of consistent treatment

Frequently Asked Questions

Will my frozen shoulder eventually get better on its own?

Most cases do improve over time, even without treatment, but the natural course can take one to three years and may leave some residual stiffness. Treatment is aimed at reducing pain, shortening that timeline, and improving the final range of motion.

Why does my shoulder hurt so much more at night?

Night pain is one of the defining features of the freezing stage. The exact reason is not fully understood, but lying flat removes the support that gravity normally gives to the shoulder, and inflammation in the capsule appears to be more painful at rest. Pain often eases as the condition moves into the frozen stage.

Is it safe to keep exercising the shoulder when it hurts?

Gentle movement and stretching, guided by a physiotherapist, are generally encouraged even during the painful stage. Complete rest tends to worsen stiffness. The aim is to work into mild discomfort, not sharp or worsening pain.

Will I get frozen shoulder in my other shoulder?

Around one in five people who have had frozen shoulder on one side develop it in the other shoulder, usually months or years later rather than at the same time. Both shoulders being frozen simultaneously is less common.

Does having diabetes change my treatment?

Frozen shoulder tends to be more severe and more prolonged in people with diabetes, and it can be more resistant to non-surgical treatment. Good blood sugar control is consistently linked with better outcomes. Steroid injections can cause a temporary rise in blood sugar that is worth planning for.

How long after surgery before I can drive?

This depends on the type of procedure, the side operated on, your pain level, and how well you can control the steering wheel safely. Most people return to driving within one to three weeks after arthroscopic release, but you should confirm with your surgeon before resuming.

Can frozen shoulder come back after successful treatment?

Recurrence in the same shoulder is uncommon once full recovery has been achieved. Maintaining range of motion with regular stretching, and managing any underlying conditions such as diabetes, supports lasting recovery.

Do I really need surgery if my shoulder is still stiff after a year?

Not necessarily. The decision is individual and depends on how much the stiffness is limiting your life, how much improvement you are still seeing month-to-month, and what non-surgical options have been tried. Surgery is one of several options your surgeon will discuss when conservative treatment has plateaued.

Conclusion

Frozen shoulder is a slow, often frustrating condition, but it is also a well-understood one with a clear treatment pathway. Most people improve with a combination of physiotherapy, pain relief, and, where helpful, steroid injections or hydrodilatation. For the smaller group whose symptoms remain severe and disabling, manipulation under anaesthesia and arthroscopic capsular release offer effective ways to restore movement, with physiotherapy afterward being just as important as the procedure itself.

Understanding which stage you are in, knowing what to expect at each step, and staying consistent with the exercise programme your physiotherapist designs are the parts of recovery that are within your control. The right combination of treatments is a conversation to have with your orthopaedic surgeon and physiotherapy team, based on your stage, your overall health, and how the shoulder is responding over time.