Frozen shoulder, medically called adhesive capsulitis, is a condition where the shoulder joint becomes painful, stiff, and difficult to move. It usually develops slowly, worsens over time, and then gradually improves, often taking months to years. To understand it properly, it helps to look at both the causes and how it is treated.
What actually happens in frozen shoulder
The shoulder is a ball-and-socket joint surrounded by a capsule of connective tissue. In frozen shoulder, this capsule becomes thickened and tight. Scar tissue can form, and the amount of lubricating fluid in the joint decreases. The result is restricted movement and pain, especially when trying to lift or rotate the arm.
Causes of frozen shoulder
There isn’t always a single clear cause. In many cases, it develops without any obvious trigger. That said, some patterns are well known.
One common cause is prolonged immobility. If you keep your shoulder still for a long time, the joint can stiffen. This often happens after injuries like fractures, rotator cuff tears, or even after surgery. For example, wearing a sling for weeks can increase the risk.
Another factor is inflammation. Conditions that cause inflammation in the body can affect the shoulder capsule, leading to tightening and stiffness over time.
Certain medical conditions are strongly linked with frozen shoulder:
Diabetes (very common association)
Thyroid disorders (both hyper and hypothyroidism)
Heart disease
Parkinson’s disease
People with diabetes, in particular, tend to have more severe and long-lasting symptoms.
Age and gender also play a role. It is more common in people between 40 and 60 years, and slightly more frequent in women.
There is also a category called idiopathic frozen shoulder, which means it occurs without any known cause. This can be frustrating because there’s no clear event to blame.
Stages of frozen shoulder
Frozen shoulder typically progresses in three stages:
Freezing stage
Pain starts gradually and increases over time. Movement becomes limited. This stage can last 6 weeks to 9 months.
Frozen stage
Pain may reduce, but stiffness becomes more noticeable. Daily activities like dressing or reaching overhead become difficult. This stage may last 4 to 12 months.
Thawing stage
Shoulder movement slowly improves. Recovery can take 6 months to 2 years.
Symptoms
The main symptoms are:
Persistent shoulder pain, often worse at night
Stiffness and reduced range of motion
Difficulty performing simple tasks like combing hair or reaching behind the back
Pain that may spread to the upper arm
Unlike some other shoulder problems, both active and passive movements are restricted. That’s a key sign doctors look for.
Diagnosis
Diagnosis is usually clinical, meaning based on symptoms and physical examination. Doctors may check how far you can move your shoulder in different directions.
Imaging tests like X-rays or MRI are sometimes used, mainly to rule out other conditions such as arthritis or rotator cuff tears.
Treatment of frozen shoulder
Here’s the thing: frozen shoulder often improves on its own, but treatment helps reduce pain and speeds up recovery.
- Pain management
Pain control is the first step, especially in the freezing stage.
NSAIDs like ibuprofen can reduce pain and inflammation
Heat therapy (warm compress) helps relax the joint
Ice packs may be used if inflammation is severe
In more severe cases, doctors may recommend corticosteroid injections into the shoulder joint. These can significantly reduce pain and improve mobility, especially in early stages. - Physiotherapy
This is the backbone of treatment.
A physiotherapist guides you through exercises that gradually improve shoulder movement. These exercises focus on:
Stretching the capsule
Improving flexibility
Restoring range of motion
Consistency matters more than intensity. Gentle, regular exercises work better than forcing movement, which can worsen pain.
Common exercises include:
Pendulum swings
Towel stretch behind the back
Wall climbing (using fingers to “walk” up the wall) - Activity modification
You don’t need complete rest. In fact, avoiding movement makes it worse.
Instead:
Keep using the shoulder within a comfortable range
Avoid sudden jerks or heavy lifting
Maintain good posture
The goal is controlled movement, not complete inactivity. - Medications for underlying conditions
If frozen shoulder is linked to conditions like diabetes or thyroid issues, managing those conditions properly is important. Poorly controlled diabetes, for example, can delay recovery. - Advanced treatments
If symptoms don’t improve after several months, more aggressive treatments may be considered.
Hydrodilatation: Fluid is injected into the joint to stretch the capsule
Manipulation under anesthesia: The shoulder is moved forcefully while you are under anesthesia to break adhesions
Arthroscopic surgery: Minimally invasive surgery to release the tight capsule
These are usually last-resort options when conservative treatments fail.
Recovery and prognosis
Most people recover, but it takes time. The full course can last anywhere from 1 to 3 years.
Some may not regain 100% of their previous range of motion, but most get enough function back for daily activities.
Early treatment, especially physiotherapy and pain control, tends to improve outcomes.
Prevention
There’s no guaranteed way to prevent frozen shoulder, but you can reduce risk:
Start gentle shoulder movement as soon as possible after injury or surgery
Avoid keeping the arm immobilized for too long
Manage chronic conditions like diabetes properly
Maintain regular shoulder mobility through simple exercises