Adhesive Capsulitis (Frozen Shoulder): Symptoms, Causes, Stages, Diagnosis, and Treatment

Adhesive capsulitis, commonly known as frozen shoulder, is a painful condition that causes progressive stiffness and loss of movement in the shoulder. It can make ordinary activities such as reaching overhead, dressing, combing your hair, fastening clothing, or sleeping on the affected side surprisingly difficult.

The medical term adhesive capsulitis of shoulder refers to inflammation and tightening of the capsule surrounding the shoulder joint. As the capsule becomes thickened and less flexible, shoulder movement becomes increasingly restricted. The condition usually improves gradually, but recovery can take many months and, in some people, several years.

This guide explains what adhesive capsulitis is, its symptoms and causes, the stages of adhesive capsulitis, how doctors diagnose it, what imaging can and cannot show, and the evidence-based options used for treatment and rehabilitation.

Medical note: This article is for education and should not replace an examination by a qualified physician or physical therapist. Persistent, severe, or unexplained shoulder pain should be professionally assessed.

What Is Adhesive Capsulitis?

So, what is adhesive capsulitis? It is a condition in which the normally flexible joint capsule around the shoulder becomes inflamed, thickened, and contracted. This reduces the amount of space available for the humeral head to move within the shoulder joint.

The result is a characteristic combination of:

• Shoulder pain
• Progressive stiffness
• Reduced active range of motion
• Reduced passive range of motion
• Difficulty performing everyday activities
• Pain that may interfere with sleep

Adhesive capsulitis vs frozen shoulder

There is generally no meaningful distinction between adhesive capsulitis vs frozen shoulder in everyday clinical language. Frozen shoulder is the common name, while adhesive capsulitis is the medical term.

However, shoulder stiffness can have many causes. Not every stiff or painful shoulder is adhesive capsulitis. Rotator cuff disorders, osteoarthritis, previous trauma, bursitis, neurological problems, and other conditions may produce similar symptoms. A proper clinical assessment is therefore important.

Adhesive Capsulitis of the Shoulder: What Happens?

The shoulder is a highly mobile ball-and-socket joint. Its flexibility allows you to reach overhead and rotate your arm in many directions.

With shoulder adhesive capsulitis, the capsule surrounding the joint becomes less compliant. Fibrotic changes and inflammation can contribute to contraction of the capsule, particularly around structures involved in normal shoulder rotation.

One of the defining clinical findings is restriction of both active and passive range of motion. In other words, the shoulder remains stiff even when another person tries to move the arm for you. Modern clinical guidance emphasizes that diagnosis is primarily based on history and physical examination, with imaging used as an adjunct when appropriate.

Adhesive Capsulitis Symptoms

The exact presentation varies from person to person, but common adhesive capsulitis symptoms include:

• Dull or aching shoulder pain
• Increasing stiffness
• Difficulty lifting the arm
• Difficulty reaching behind the back
• Reduced external rotation
• Difficulty putting on a shirt or jacket
• Difficulty reaching a high shelf
• Pain when lying on the affected shoulder
• Sleep disturbance
• Reduced ability to perform work or household activities

Pain is often worse during the earlier part of the condition. As stiffness becomes more prominent, some patients notice that pain decreases while movement remains significantly restricted. (OrthoInfo)

Adhesive capsulitis upper arm pain may also be described as aching around the outer shoulder or upper arm rather than directly over the joint.

The Stages of Adhesive Capsulitis

A typical frozen shoulder progresses through three clinical stages. The duration is variable, so these stages should not be treated as an exact timetable for every patient.

1. Freezing stage

During the freezing stage, shoulder pain gradually increases and movement begins to decrease.

People may notice pain when reaching, rotating the arm, or sleeping. As the condition progresses, activities become increasingly difficult.

This phase can last several weeks to several months. AAOS patient information describes a typical duration of roughly six weeks to nine months. (OrthoInfo)

2. Frozen stage

During the frozen stage, stiffness becomes the dominant problem.

Pain may become less intense than during the freezing phase, but the shoulder can be extremely difficult to move. Reaching overhead, behind the back, or outward may be particularly restricted.

This phase can last several months.

3. Thawing stage

In the thawing stage, shoulder movement gradually returns.

Recovery is usually slow rather than sudden. Strength and mobility can continue improving for months after pain has substantially decreased. AAOS notes that complete recovery of strength and motion may take from approximately five months to two years during this stage, while some people may take even longer overall. (OrthoInfo)

These stages of adhesive capsulitis explain why someone can experience less pain but still have significant stiffness.

Causes and Risk Factors

The precise biological cause of primary adhesive capsulitis is not always known. Some cases develop without an obvious trigger.

1- Primary adhesive capsulitis

Primary adhesive capsulitis refers to frozen shoulder that develops without a clearly identifiable underlying shoulder injury or condition.

It is sometimes called idiopathic adhesive capsulitis.

2- Secondary adhesive capsulitis

Secondary frozen shoulder occurs in association with another condition, injury, surgery, or a period of shoulder immobilization.

Potential risk factors include:

• Diabetes
• Thyroid disorders
• Previous shoulder injury
• Shoulder surgery
• Prolonged immobilization
• Certain neurological conditions
• Some cardiovascular conditions

Diabetes and thyroid disease have particularly strong associations with frozen shoulder. People with diabetes may also experience more persistent stiffness. (OrthoInfo)

Primary vs secondary adhesive capsulitis

The distinction between primary vs secondary adhesive capsulitis is mainly about whether an identifiable associated condition or event is present.

For example, someone who develops progressive shoulder stiffness without an obvious precipitating event may be classified as having primary disease. Someone who develops significant stiffness after a period of immobilization following shoulder surgery may have secondary adhesive capsulitis.

Adhesive Capsulitis and Diabetes

The relationship between adhesive capsulitis and diabetes is clinically important. People with diabetes have a substantially higher risk of developing frozen shoulder than the general population.

Thyroid disease has also been associated with an increased risk. Recent clinical practice guidance identifies diabetes, thyroid disease, and dyslipidemia among important risk factors. (PubMed)

If you have diabetes and develop persistent shoulder stiffness, it is worth discussing the symptoms with your healthcare professional rather than assuming they will resolve quickly on their own.

Diagnosis

Adhesive capsulitis diagnosis is primarily clinical.

A clinician will usually ask about:

• When the pain started
• Whether symptoms developed gradually or suddenly
• Previous injuries
• Previous shoulder surgery
• Medical conditions such as diabetes or thyroid disease
• Changes in daily function
• Sleep disturbance
• Which shoulder movements are restricted

The physical examination then assesses active and passive shoulder motion, strength, pain, and other findings that may help distinguish frozen shoulder from other causes of shoulder pain.

Special tests for adhesive capsulitis

There is no single special test for adhesive capsulitis that independently proves the diagnosis.

Instead, clinicians look for a characteristic pattern of restricted active and passive movement, particularly loss of external rotation, while also considering alternative diagnoses.

Various special tests for adhesive capsulitis, orthopedic tests, and range-of-motion measurements can contribute to the assessment, but they should be interpreted as part of the complete clinical examination rather than in isolation.

X-Ray, Ultrasound, and MRI

Imaging can be useful, but it is important to understand its role.

X-ray

An adhesive capsulitis X-ray may appear normal or may show other findings that help identify an alternative diagnosis.

Plain radiographs are particularly useful for looking for problems such as significant arthritis, fracture, or other structural abnormalities.

A normal X-ray does not rule out frozen shoulder.

MRI

Adhesive capsulitis radiology findings can include abnormalities associated with capsular thickening and inflammation.

MRI may demonstrate findings such as thickening of portions of the joint capsule or abnormalities around the rotator interval and axillary recess. However, MRI should not be considered a standalone diagnostic test.

Current clinical practice guidance recommends ultrasound and MRI as adjunctive tools alongside clinical assessment rather than as independent methods for diagnosing primary frozen shoulder. This is why an adhesive capsulitis shoulder MRI may support a diagnosis while the patient's history and physical examination remain central.

Ultrasound

Ultrasound can be useful for assessing the shoulder and excluding or identifying other pathology. It may also provide information about structures associated with frozen shoulder.

However, adhesive capsulitis ultrasound should be interpreted in the context of the clinical presentation.

Adhesive Capsulitis vs Rotator Cuff Injury

The distinction between adhesive capsulitis vs rotator cuff injury is important because treatment can differ.

A person with a rotator cuff problem may have pain and weakness, but passive shoulder movement can be relatively preserved depending on the specific injury.

In adhesive capsulitis, both active and passive movement are typically restricted.

This difference is one reason a physical examination is so important. A clinician may also consider bursitis, arthritis, cervical spine disorders, nerve problems, and other causes of shoulder pain.

Treatment

The best adhesive capsulitis treatment depends on the stage of the condition, severity of symptoms, functional limitations, other medical conditions, and response to treatment.

There is no single treatment that works identically for every patient.

Common components of management of adhesive capsulitis include:

1. Pain management
2. Maintaining or gradually restoring shoulder mobility
3. Exercise therapy
4. Physical therapy
5. Selected injections
6. Hydrodilatation in appropriate cases
7. Surgery for selected patients who do not improve adequately with nonsurgical care

Adhesive Capsulitis Physical Therapy

Adhesive capsulitis physical therapy generally focuses on controlling pain while progressively restoring movement and function.

A physical therapist may assess:

• Shoulder range of motion
• Joint mobility
• Functional limitations
• Pain behavior
• Posture and movement patterns
• Strength
• Ability to perform daily activities

Treatment can include education, mobility exercises, stretching, manual therapy, and progressive strengthening when appropriate.

The intensity of therapy should match the irritability of the shoulder. Aggressive stretching that causes a significant increase in pain is not necessarily better.

Adhesive capsulitis physical therapy protocol

There is no universal adhesive capsulitis physical therapy protocol that should be followed identically by everyone.

A practical rehabilitation approach usually changes according to symptoms and stage.

During a highly painful phase, treatment may emphasize gentle movement and pain control. As irritability decreases, longer-duration stretching and progressive strengthening may become more appropriate.

Adhesive Capsulitis Exercises

Adhesive capsulitis exercises should be gentle, consistent, and appropriate for the individual's current level of pain and stiffness.

Commonly prescribed movements may include:

Pendulum exercise

Lean forward while supporting the unaffected arm on a stable surface. Allow the affected arm to hang comfortably and make small, relaxed movements.

Assisted shoulder flexion

Using the unaffected arm or an appropriate aid, gently assist the affected arm upward within a comfortable range.

External rotation stretch

With the elbow supported close to the body, gently rotate the forearm outward using an appropriate assistance method.

Towel or behind-the-back stretch

A towel can sometimes be used to assist shoulder movement behind the back. This should be introduced carefully because it can aggravate a highly irritable shoulder.

Shoulder strengthening

Strengthening exercises may become useful as mobility and pain improve. Current guidance indicates that strengthening may help pain and functional recovery, although the evidence base is less robust than for some other interventions. The key principle is that shoulder adhesive capsulitis exercises should be individualized rather than copied from a generic program.

Manual Therapy for Adhesive Capsulitis

Manual therapy for adhesive capsulitis may include therapist-applied joint mobilization and soft-tissue techniques designed to improve movement and reduce discomfort.

Manual therapy is generally used alongside active exercises rather than as a replacement for them.

The 2025 clinical practice guideline states that manual therapy combined with range-of-motion exercises may be considered for improving upper-limb function and shoulder range of motion. (PubMed Central (PMC))

Injections and Hydrodilatation

An adhesive capsulitis injection commonly refers to a corticosteroid injection intended to reduce pain and inflammation.

An adhesive capsulitis treatment injection may be particularly useful when pain is preventing the patient from participating effectively in rehabilitation.

Another option is capsular distension, also called hydrodilatation, in which fluid is introduced into the joint under clinical guidance to stretch the capsule. Evidence and preferred techniques vary, so the procedure should be discussed with an appropriately qualified clinician.

Recent guidance supports intra-articular steroid injections and indicates that physiotherapy or hydrodilatation combined with steroid injection may be beneficial in appropriate patients. (PubMed Central (PMC))

When Is Surgery Considered?

Most people are treated without surgery. However, persistent severe stiffness and functional limitation despite appropriate nonsurgical treatment may lead a specialist to consider an intervention.

Adhesive capsulitis surgery may include arthroscopic capsular release. Another historical or specialist option is manipulation under anesthesia, although the suitability of any procedure depends on the individual patient and potential risks.

Surgery is not automatically necessary simply because the shoulder has remained stiff for several months. The decision should consider symptoms, functional limitations, previous treatment, medical risk factors, and the patient's goals.

AAOS educational material describes physical therapy as a primary treatment and notes that surgical options may be considered in selected cases. (OrthoInfo)

Adhesive capsulitis surgery recovery time

Adhesive capsulitis surgery recovery time varies considerably. Rehabilitation after a capsular release is important because maintaining the motion gained during the procedure is a major part of recovery.

Your orthopedic surgeon and physical therapist should provide a postoperative rehabilitation schedule tailored to the procedure and your condition.

When Should You See a Doctor?

Seek professional assessment if shoulder pain or stiffness:

• Continues or progressively worsens
• Interferes with sleep
• Prevents normal daily activities
• Causes substantial loss of movement
• Develops after surgery or injury
• Is accompanied by significant weakness
• Is associated with neurological symptoms
• Does not improve with reasonable self-care

Urgent assessment may be appropriate for severe pain after significant trauma, obvious deformity, sudden major weakness, fever with a hot/swollen joint, or other concerning symptoms.

Frequently Asked Questions

Is adhesive capsulitis the same as frozen shoulder?

Yes. Adhesive capsulitis is the medical term commonly used for frozen shoulder.

How long does adhesive capsulitis last?

The duration varies. The condition often progresses through freezing, frozen, and thawing stages, and complete recovery can take many months or longer. Some people experience symptoms for several years. (OrthoInfo)

What is the best exercise for adhesive capsulitis?

There is no single best exercise for everyone. Gentle range-of-motion and stretching exercises are commonly used, with strengthening added when appropriate. Exercise selection should reflect the person's stage, pain level, mobility, and functional goals.

Does an MRI show adhesive capsulitis?

MRI can show findings associated with adhesive capsulitis and can help evaluate other shoulder problems. However, MRI is considered an adjunct to clinical diagnosis rather than a standalone diagnostic test. (PubMed Central (PMC))

Can adhesive capsulitis go away without surgery?

Yes. Many people improve with nonsurgical management, although recovery can be slow. Physical therapy, appropriate exercises, pain management, and selected injections are among the treatments that may be considered. (OrthoInfo)