Frozen Shoulder (Adhesive Capsulitis): A Complete Patient Guide

1. What Exactly Is Frozen Shoulder?

Frozen shoulder, medically called adhesive capsulitis, is a condition in which the shoulder becomes progressively painful and stiff. The capsule surrounding the ball-and-socket shoulder joint becomes inflamed, thickened and tight, limiting the amount the joint can move.

The characteristic feature is restriction of both active movement (movement you perform yourself) and passive movement (movement when the doctor moves your relaxed arm). External rotation — turning the forearm outward with the elbow beside the body — is commonly one of the most restricted movements.

2. Who Is More Likely to Develop It?

Frozen shoulder is most often seen in middle age. Sometimes it begins without an obvious injury; in other patients it follows a period in which the arm has not been moving normally.

• Diabetes mellitus is an important associated condition.
• Thyroid disease is also associated with adhesive capsulitis.
• It may occur after a shoulder injury or shoulder surgery.
• Prolonged limitation of arm movement can increase the likelihood of stiffness.
• A previous frozen shoulder increases the possibility of the condition occurring in the other shoulder.

3. Common Symptoms

• Gradually increasing shoulder pain, often without one major injury.
• Pain that may be worse at night and disturb sleep.
• Increasing difficulty lifting the arm overhead or away from the body.
• Difficulty reaching behind the back to wear clothes, fasten garments or use a back pocket.
• Difficulty combing hair, bathing, dressing or reaching a shelf.
• A feeling that the shoulder is becoming progressively stiff or “blocked.”

Pain and stiffness do not always progress at exactly the same rate. Some patients are mainly troubled by pain early on, while others present later with stiffness as the dominant problem.

4. The Three Classical Stages

Frozen shoulder is traditionally described in three overlapping stages. These are useful for understanding the condition, but an individual patient may not fit neatly into a fixed calendar.

5. How Is Frozen Shoulder Diagnosed?

The diagnosis is primarily based on your history and physical examination. Your doctor compares active and passive shoulder movement and looks for the characteristic capsular pattern of restriction.

An MRI is not automatically required. Imaging is selected according to the clinical situation. A shoulder X-ray may be used to exclude other causes of painful stiffness, particularly arthritis or a bony problem. Ultrasound or MRI may be considered when the diagnosis is uncertain or another condition such as a rotator-cuff tear is suspected.

Conditions that may sometimes mimic or coexist with frozen shoulder include shoulder osteoarthritis, rotator-cuff disease, calcific tendinitis, previous fracture-related stiffness and pain referred from the neck.

6. Treatment: A Stepwise Approach

Treatment is individualized according to how painful the shoulder is, how much movement has been lost, the stage of the condition, your general health and how much your daily activities are affected. Most patients begin with non-operative treatment.

Hydrodilatation

Hydrodilatation (distension of the shoulder joint capsule using injected fluid, usually with local anaesthetic and often corticosteroid) is another treatment option used in selected patients. Evidence suggests it can help some patients, although no single intervention is clearly best for everyone.

When Is Surgery Considered?

Surgery is not the first treatment for most frozen shoulders. If substantial pain and restriction persist despite an adequate course of non-operative management, specialist options may include manipulation under anaesthesia or arthroscopic capsular release.

The large UK FROST trial found no clinically important superiority of arthroscopic capsular release, manipulation under anaesthesia, or early structured physiotherapy with steroid injection at the main follow-up point. This supports shared decision-making rather than assuming that a more invasive procedure automatically gives a better result.

7. Exercise and Physiotherapy: How Hard Should You Push?

Movement is important, but aggressively forcing a very painful shoulder is not the goal. Exercises should be matched to your irritability and stage. During a highly painful phase, gentle pain-limited mobility may be more appropriate; stretching can be progressed as pain settles.

• Perform exercises taught specifically for your shoulder rather than inventing strenuous routines.
• Avoid repeatedly forcing the arm through sharp or severe pain.
• Do not keep the shoulder completely immobile unless there is a separate medical reason to do so.
• Progress range-of-motion and later strengthening according to your clinician or physiotherapist.

8. What Can You Do at Home?

• Keep the shoulder gently moving within the range advised to you.
• Use heat or cold packs safely, wrapped in cloth, according to which feels more comfortable.
• Modify painful activities temporarily rather than completely abandoning use of the arm.
• Use prescribed or advised pain medication only when it is suitable for you.
• Be consistent with your rehabilitation rather than doing occasional forceful stretching.
• Expect progress to be measured over weeks and months rather than days.

If night pain is troublesome, some people find it more comfortable to sleep on the opposite side with a pillow supporting the affected arm. This is a comfort strategy, not a treatment for the capsule itself.

9. When Shoulder Pain May Not Be “Just Frozen Shoulder”

Seek medical assessment promptly if symptoms are unusual for a gradual frozen shoulder or if you develop features suggesting injury, infection, nerve involvement or another cause.

10. Frequently Asked Questions

Will frozen shoulder get better?
Many patients improve gradually, but the process is slow. Recovery may take many months and sometimes one to two years or longer. The degree and speed of recovery vary between patients.

Is a steroid injection compulsory?
No. It is one option. It may be particularly helpful for short-term pain relief in an appropriate patient, making sleep and rehabilitation easier. Risks and suitability should be discussed with your treating doctor.

Can physiotherapy make frozen shoulder worse?
Appropriately dosed rehabilitation is a core treatment. However, repeatedly forcing a very painful shoulder can aggravate symptoms. The intensity should be matched to the stage and irritability of the shoulder.

Do I need an operation?
Usually not initially. More invasive procedures are generally reserved for persistent, functionally important symptoms despite an adequate trial of non-operative treatment.

Can frozen shoulder come back?
Recurrence in the same shoulder is considered uncommon, but the opposite shoulder can be affected in some patients, particularly in those with associated risk factors.

Authentic Sources & Further Reading

This patient guide is educational and is based on established orthopaedic and medical sources. The links below are provided so patients can read the underlying guidance directly.

• American Academy of Orthopaedic Surgeons (AAOS) OrthoInfo — Frozen Shoulder
• NHS — Frozen Shoulder
• BMJ Clinical Update — Frozen Shoulder
• BMJ — What is the most effective treatment for frozen shoulder?
• BMJ Best Practice — Adhesive Capsulitis

Medical information changes as new evidence emerges. This page is for general patient education and does not replace an examination, diagnosis or individualized treatment plan.