Overview
Frozen shoulder is often thought of as a local shoulder problem. But for people living with diabetes, the risk can be substantially higher.
An earlier meta-analysis found that people with diabetes were about five times more likely to develop frozen shoulder than people without diabetes. More recent evidence continues to confirm a strong association, with a 2026 systematic review and meta-analysis estimating that people with diabetes had approximately 3.7 times higher odds of developing adhesive capsulitis.
So why does diabetes make the shoulder more vulnerable?
The answer appears to involve a combination of chronic blood sugar exposure, changes in collagen, inflammation and fibrosis within the shoulder capsule.
Frozen shoulder, or adhesive capsulitis, occurs when the capsule surrounding the shoulder joint becomes inflamed, thickened and progressively stiff.
The shoulder is normally one of the body’s most mobile joints. It relies on a flexible joint capsule to allow movements such as:
- Raising the arm overhead
- Reaching behind the back
- Putting on a shirt
- Combing the hair
- Reaching for objects on a high shelf
With frozen shoulder, these movements gradually become painful and restricted.
Unlike many other causes of shoulder pain, frozen shoulder typically causes restriction of both active and passive movement. In other words, even when someone else tries to move the arm, the shoulder remains stiff.
Frozen shoulder generally progresses through stages:
1. Freezing stage
Pain gradually increases and movement starts becoming restricted. Night pain can be particularly troublesome.
2. Frozen stage
Pain may begin to settle, but stiffness becomes more pronounced. Everyday activities can become difficult.
3. Thawing stage
Shoulder movement gradually improves, although recovery can take months and sometimes considerably longer.
The underlying biology involves inflammation followed by fibrosis and abnormal collagen deposition within the joint capsule.
Treatment and management
Treatment for a frozen shoulder focuses on easing pain and recovering normal movement using pain relief, physical therapy, and gentle home exercises.
- Oral pain relievers: Over-the-counter options like ibuprofen or naproxen help lower swelling and discomfort.
- Steroid injections: Cortisone shots directly into the joint reduce severe inflammation, especially during the early painful stage.
- Hydrodilatation: A doctor injects sterile fluid into the joint capsule to stretch the tissue and make movement easier
- Supervised therapy: A physical therapist guides you through safe stretches to loosen the shoulder capsule.
- Heat and cold therapy: Apply an ice pack to numb sharp pain or use a warm towel/heating pad to relax tight muscles before doing stretches.
- Gentle movement: Do easy home movements like pendulum swings or table slides, avoiding any sharp or forced pain
- Manipulation under anesthesia: A doctor gently moves your arm while you sleep under general anesthesia to break up tight scar tissue.
- Surgery: Arthroscopic surgery to remove scar tissue is rare and only used if other treatments fail.
- The appropriate treatment depends on the stage of frozen shoulder, severity of symptoms, medical history and individual response to treatment.
People with diabetes should also discuss any treatment that could affect blood glucose levels with their healthcare professional. This is particularly relevant when corticosteroids are being considered.
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