Frozen Shoulder: Causes, Symptoms & Treatment Options

Written by Dr Ajay Shakya, BPT, MPT (Neurological Conditions) | Published: August 2026. All clinical content is cross-referenced against peer-reviewed literature and current physiotherapy practice. See References below.

Quick Summary

Frozen shoulder (adhesive capsulitis) is inflammation and thickening of the shoulder capsule, causing pain and progressive stiffness. It affects roughly 2–5% of the general population, mostly ages 40–70, and slightly more women than men. Diabetics have up to 3.7 times higher odds of developing frozen shoulder than non-diabetics. It progresses through 4 stages: painful, freezing, frozen, and thawing. This occurs over roughly 12 to 24 months. Most cases resolve with physiotherapy and conservative care; surgery (MUA or arthroscopic release) is reserved for refractory cases.

1. What is Frozen Shoulder?

Frozen shoulder, medically known as adhesive capsulitis, is a painful condition that causes severe stiffness and limits the normal range of motion in your shoulder joint. Over time, the shoulder becomes increasingly difficult and painful to move, making simple everyday activities—like reaching overhead, putting on a jacket, or washing your hair—feel almost impossible.

To understand what happens, picture your shoulder joint as a ball-and-socket structure wrapped in a flexible, protective sleeve of tissue called the joint capsule. In a healthy shoulder, this capsule is loose and lubricated, allowing your arm to rotate and lift effortlessly. When frozen shoulder develops, this capsule becomes inflamed, thickens, and tightens around the joint. Scar tissue, known as adhesions, begins to form inside the capsule, leaving very little room for the shoulder ball to glide smoothly.

This tightness creates a double challenge: intense pain paired with severe physical restriction. Unlike a simple muscle strain where you can still force movement, frozen shoulder physically locks the joint. Even if another person tries to lift your arm, the joint remains firm and stuck. It typically affects people between 40 and 70 years old—more commonly women—and often triggers after a prolonged period of shoulder immobility due to surgery, an injury, or underlying conditions like diabetes. Fortunately, while the condition develops slowly over four distinct stages, it is manageable and generally resolves over time with proper physical therapy and medical care.

2. Frozen Shoulder Causes

Frozen shoulder usually falls into two main categories: primary (when it happens suddenly for no obvious reason) or secondary (when triggered by another medical condition or injury).

Key Causes & Risk Factors

• Diabetes: This is one of the biggest risk factors. People with diabetes are nearly 4 times more likely to get a frozen shoulder than non-diabetics.
• Thyroid Issues: An overactive or underactive thyroid gland increases your risk.
• Keeping the Arm Still (Immobilization): If your arm has been in a sling or kept still for a long time after a fracture, surgery, or injury, the joint can freeze.
• Other Health Conditions: Heart disease and conditions like Dupuytren's contracture (where hand tissue thickens) share similar scarring processes with frozen shoulder.
• Age and Gender: It mostly affects people between 40 and 70 years old, and women get it more often than men.

What is Happening Inside the Joint?

At the tissue level, the protective lining around your shoulder joint becomes chronically inflamed. Over time, this inflammation causes fibrosis. The tissue thickens, forms stiff scar tissue, and sticks tightly to the surrounding bones and structures, locking the joint in place.

3. Frozen Shoulder Symptoms

The two main signs of a frozen shoulder are pain and stiffness that worsen over time. Here is what it typically feels like:

• Deep, Aching Pain: You will feel a constant, dull ache deep in your shoulder. This pain usually worsens at night and can make sleeping on the affected side uncomfortable.

• Locked Joint (Active & Passive Restriction): Moving your shoulder becomes increasingly difficult. Whether you try to lift your arm yourself (active movement) or a doctor tries to lift it for you (passive movement), the joint physically stops and will not budge.

• Struggle with Everyday Tasks: 

Simple daily movements become major challenges, such as:

1. Reaching overhead (to grab something from a high shelf)
2. Reaching behind your back (to hook a bra, tuck in a shirt, or reach for a wallet)
3. Reaching across your body (to put on a seatbelt)

• Ongoing Stiffness: As the condition progresses, the sharp pain may fade, but stiffness remains longer until the joint begins to thaw.

4. 4 Stages of Frozen Shoulder

Frozen shoulder typically progresses through four recognized stages in 12 to 24 months:

Stage	Duration / Focus	Key Features
1. Painful (Freezing)	Less than 3 months	Gradual onset of pain, mild ROM loss, difficulty lying on the affected side
2. Freezing	3–9 months	Severe night pain, significant loss of active and passive ROM
3. Frozen	9–14 months	Marked stiffness; pain mainly at end-range motion or at night
4. Thawing	Dynamic control and return to activity	Minimal pain; gradual return of range of motion via capsular remodeling

Clinical Pearl: Patients often mistake the "frozen" stage for treatment failure because pain decreases while stiffness remains. This staging pattern is expected and explains why treatment should shift as the patient moves from a pain-dominant to a stiffness-dominant stage.

5. Diagnosis of Frozen Shoulder

Diagnosing frozen shoulder relies mostly on a physical exam and your medical history rather than scans or tests.

• Physical Movement Test: A doctor or physiotherapist will check how far you can move your arm on your own (active) and how far they can move it for you (passive). The classic sign of frozen shoulder is a severe loss of external rotation, meaning you cannot rotate your arm outward, like turning a doorknob or opening your arm to hug someone.
• X-rays: Simple X-rays usually show normal bones. Doctors use them mainly to rule out other causes of pain, such as severe arthritis or a bone fracture.
• Ultrasound or MRI Scans: These are generally not needed for a basic diagnosis. If ordered, they may show a thickened, inflamed shoulder capsule.
• Blood Tests: Because conditions like diabetes and thyroid problems are so closely linked to frozen shoulder, your doctor may order simple blood tests to screen for them.

6. Management and Treatment

No universally agreed gold-standard treatment exists for frozen shoulder. Most evidence supports an individualized, multimodal approach tailored to the patient's stage and specific factors. Management falls into three categories: general/conservative treatment, physiotherapy, and, for a smaller subset of refractory cases, surgical intervention.

General Treatment of Frozen Shoulder

In the early painful stage, the priority is to calm inflammation and pain rather than aggressively stretch the joint. Common conservative measures include:

• Anti-inflammatory medications (NSAIDs) for pain relief
• Corticosteroid injections into the joint, often combined with physiotherapy, are particularly effective in the painful and freezing stages
• Hydrodilatation (distension of the joint capsule with fluid), used in some cases to improve range of motion
• Activity modification — avoiding painful end-range positions while staying gently active
• Blood sugar management for diabetic patients, since poor glycemic control is linked to slower recovery

Surgical Treatment of Frozen Shoulder

Surgery is generally considered only after at least 6 months of non-surgical management has failed to produce adequate improvement. The two principal surgical options are:

• Manipulation Under Anesthesia (MUA): The shoulder is gently but forcefully moved through its range of motion while the patient is under anesthesia, mechanically tearing the tightened capsule.
• Arthroscopic Capsular Release (ACR): A minimally invasive surgical procedure where the tight capsule is precisely released using arthroscopic instruments.

A 2024 systematic review and meta-analysis found that pain relief, functional improvement, and range-of-motion gains were largely comparable between ACR and MUA in the short term. ACR showed a higher rate of severe complications and somewhat better long-term pain relief, while MUA remained simpler and more cost-effective. The right choice depends on your surgeon's assessment, your response to conservative treatment, and individual risk factors.

Physiotherapy Treatment of Frozen Shoulder

Physiotherapy is central to frozen shoulder management at every stage, with goals shifting as the condition progresses:

• Painful stage: Gentle pain-relieving modalities, pendulum exercises, and activity modification. Aggressive stretching is generally avoided.
• Freezing/Frozen stage: Progressive manual therapy, joint mobilizations, and controlled stretching to preserve and gradually restore range of motion.
• Thawing stage: Strengthening, functional retraining, and return to normal overhead and reaching activities.
• Post-surgical (MUA/ACR): Structured passive-to-active rehabilitation usually begins the day after the procedure to maintain the range of motion gained during surgery.

At Physio Health and Wellness, treatment plans are staged to match exactly where a patient is in the frozen shoulder timeline. Treating a "frozen stage" shoulder the same way as a "painful stage" shoulder is a common reason people do not see the progress they expect.

7. Exercises for Frozen Shoulder

Below are common exercises for frozen shoulder rehabilitation. They should be introduced gradually and guided by a physiotherapist, especially during the painful stage.

Exercise	Sets x Reps / Time	Best Stage
Pendulum swings	2 x 30 seconds	Painful, Freezing
Wall crawl (finger walk)	3 x 10	Freezing, Frozen
Cross-body stretch	3 x 20-second hold	Frozen, Thawing
Towel stretch (behind back)	3 x 10	Frozen, Thawing
External rotation with resistance band	3 x 12	Thawing

8. Recovery and Prognosis

Frozen shoulder is generally considered a self-limiting condition, meaning most cases eventually resolve, but "self-limiting" does not mean quick. The natural course commonly lasts 12 to 24 months. Some patients have mild residual stiffness even after recovery. Diabetic patients and those with a more severe frozen stage tend to have slower, less complete recovery. This is one reason early, staged treatment matters. Consistent engagement in physiotherapy, rather than passively waiting for the condition to pass, is associated with better functional outcomes.

9. Prevention

Since primary frozen shoulder often has no identifiable trigger, prevention isn't guaranteed, but risk can be reduced by:

• Keeping blood sugar controlled if you're diabetic, given the strong diabetes-frozen shoulder link
• Avoiding unnecessary prolonged immobilization of the shoulder after a minor injury. Gentle movement, once cleared by a professional, is usually better than a sling for weeks. Addressing shoulder stiffness or minor pain early rather than "waiting it out"
• Maintaining regular shoulder mobility, especially if you have a desk-based or sedentary routine

10. When to See a Doctor?

Consult a physiotherapist or physician if you notice shoulder pain worsening over weeks, night pain disrupting your sleep, or a noticeable reduction in your shoulder's range of motion, especially when reaching overhead or behind your back. Early evaluation during the painful stage allows treatment to start before significant stiffness develops.

11. FAQs

Q1. What is the best treatment for a frozen shoulder?

There's no single "best" treatment. The right approach depends on your stage. Early on, pain control and physiotherapy work best. If stiffness persists beyond six months of conservative care, manipulation under anesthesia or arthroscopic capsular release becomes an option.

Q2. What is the main reason for frozen shoulder?

In most cases, there is no single identifiable cause, referred to as "primary" frozen shoulder. The strongest risk factor is diabetes, which raises the odds of developing it nearly 3.7 times compared to non-diabetics.

Q3. What is the best position to sleep in if I have a frozen shoulder?

Sleeping on your back with the affected arm supported by a pillow works best for most people. Lying directly on the painful shoulder often triggers night pain in the freezing stage. If back sleeping is uncomfortable, side-sleep on the unaffected shoulder with a pillow under the affected arm for support. This prevents the joint from rolling forward and pinching under body weight. Avoid sleeping directly on the affected side until the pain has settled.

Q4. How do you unfreeze a shoulder?

"Unfreezing" a shoulder is a gradual process, not a single fix. The approach needs to match the stage you are in. In the painful stage, the priority is to calm inflammation with gentle pendulum swings, provide pain relief, and avoid aggressive stretching. As pain settles and stiffness becomes the main issue (freezing/frozen stage), progressive manual therapy and stretching, such as wall crawls, cross-body stretches, and towel stretches, become the primary tools for restoring range of motion. If stiffness does not respond adequately to a genuine trial of physiotherapy, generally six months or more, manipulation under anesthesia or arthroscopic capsular release can mechanically release the tightened capsule. Rushing to aggressive stretching in the wrong stage is a common mistake that can prolong pain rather than speed recovery.

Q5. Is frozen shoulder curable at home?

Mild cases can improve substantially with consistent home management: gentle range-of-motion exercises, heat before stretching, activity modification, and patience because the condition is largely self-limiting over 12 to 24 months. However, "curable at home" has limits. Home exercises alone are often not enough to prevent significant stiffness. Doing the wrong exercise at the wrong stage, such as forceful stretching during the acute, painful phase, can make things worse. A physiotherapist assessment, even just once to confirm your stage and get a tailored exercise plan, usually leads to a faster, more complete recovery than guesswork at home.

Q6. What vitamin is good for frozen shoulder?

Vitamin D has the most research in this context. Several studies have found an association between vitamin D deficiency and frozen shoulder, including one Indian study in which patients with vitamin D deficiency reported higher pain scores than those with adequate levels. This is a correlation observed in research, not a proven cure. Vitamin D supplementation is not a substitute for physiotherapy or medical treatment. If you suspect a deficiency, get your levels checked and discuss supplementation with your doctor alongside standard frozen shoulder treatment.

Q7. How serious is a frozen shoulder?

It's not life-threatening, but it can seriously disable daily functions. Dressing, reaching overhead, driving, and sleeping are commonly affected, sometimes for a year or more if untreated. If left unmanaged, some patients have residual stiffness even after the "thawing" stage. The seriousness lies less in danger and more in how long it can disrupt normal life if not actively managed.

Q8. Is it good to massage a frozen shoulder?

Gentle massage around the shoulder and upper back can ease muscle tension and improve comfort, especially in the later frozen or thawing stages. However, deep or aggressive massage directly into the joint during the acute painful stage can worsen inflammation and increase pain. Massage works best as a complement to guided physiotherapy, not a replacement for the mobilization and stretching techniques a physiotherapist uses to address the capsule.

Q9. Will a frozen shoulder heal on its own?

In most cases, yes. Frozen shoulder is a self-limiting condition that resolves naturally over about 12 to 24 months through four stages. But "will heal" does not mean "will heal fully or quickly." If left untreated, recovery takes longer, pain is often more severe, and some patients have permanent mild stiffness. Active management, such as physiotherapy, staged exercises, and pain control, usually leads to faster recovery and a better final range of motion than passive waiting.

Read More

• Deltoid Ligament Sprain
• Biceps Tendinitis
• Rotator Cuff Tears
• Shoulder Mobilization Techniques

References

1. Kingston K, Curry EJ, Galvin JW, Li X. Adhesive capsulitis of the shoulder — is there consensus regarding the treatment? A comprehensive review. PMC5366387

2. Zreik NH, Malik RA, Charalambous CP. Diabetes as a risk factor for the onset of frozen shoulder: a systematic review and meta-analysis. PubMed 36599641

3. Mezian K, Coffey R, Chang KV. Adhesive Capsulitis (Frozen Shoulder). StatPearls. NCBI Bookshelf NBK532955

4. Date A, Rahman L. Frozen shoulder: overview of clinical presentation and review of the current evidence base for management strategies. PMC7720362

5. Prevalence of Diabetes Mellitus and Thyroid Disease in Patients Diagnosed with Adhesive Capsulitis. J Sci Med Central

6. Sarasua SM, Floyd S, Bridges WC, et al. The epidemiology and etiology of adhesive capsulitis in the U.S. Medicare population. PMC8474744

7. Zhao Y, Yang T, Feng C, Li L, Pang L, Zhao S. Arthroscopic Capsular Release Versus Manipulation under Anesthesia for Refractory Frozen Shoulder: A Systematic Review with Meta-Analysis. PMC11216839

8. Similar outcomes between arthroscopic capsular release and manipulation under anesthesia for frozen shoulder: A meta-analysis. ScienceDirect

9. Hand C, Clipsham K, Rees JL, et al. Long-term outcome of frozen shoulder. J Shoulder Elbow Surg. 2008;17:231-236.

Medical Disclaimer: This content is for informational purposes and is not a substitute for professional medical diagnosis or treatment. Always consult a qualified physiotherapist or physician for concerns specific to your condition.

DR

Ajay Shakya

BPT, MPT (Neurological Conditions) · 10+ years of experience

Certified physiotherapist and manual therapist with over 10 years of clinical experience. Specializes in neurological rehabilitation, back pain, neck pain, and sports injuries.

BPT Graduation MPT Neurological Certified Manual Therapist

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