Frozen Shoulder: Why It Happens, the 3 Stages, and Exercises That Speed Recovery

What is frozen shoulder?

Frozen shoulder (adhesive capsulitis) is a condition where the capsule — the flexible sleeve of tissue surrounding the shoulder joint — becomes inflamed, thickened and tight. The shoulder gradually loses movement in all directions: reaching overhead, behind the back, or out to the side all become restricted and painful.

It typically affects people between 40 and 60, is more common in women, and is strikingly more frequent in people with diabetes — who are up to five times more likely to develop it and may have a slower recovery.

The three stages — and what to expect in each

Without treatment the full cycle can take 2–3 years. With the right programme of stretching, pain control and — where needed — injections or a small procedure, recovery is usually much faster and more comfortable.

• Stage 1 — Freezing (2–9 months): Pain dominates. It worsens gradually, is often worst at night, and movement starts to restrict. Many patients are told it is a 'sprain' at this stage.
• Stage 2 — Frozen (4–12 months): Pain may ease, but stiffness peaks. The shoulder feels locked; daily tasks like dressing, reaching a shelf or fastening clothing become difficult.
• Stage 3 — Thawing (6–24 months): Movement gradually returns. With appropriate treatment, most patients regain near-full function.

What causes it?

A key principle: a painful shoulder that is kept still becomes a stiff shoulder. Early, guided movement — even when uncomfortable — prevents the worst stiffness. Diagnosis is clinical, supported by X-ray or ultrasound to rule out other causes like rotator cuff tears or arthritis.

• Diabetes and thyroid disorders — the strongest associations
• Prolonged shoulder immobilisation after an injury, fracture or surgery
• Minor injuries or overuse that lead to guarding the shoulder
• Often, no identifiable cause at all (idiopathic frozen shoulder)

Exercises that genuinely help

Stretching must be gentle, regular and pain-limited — forcing a frozen shoulder aggressively backfires. Perform these daily, ideally after a warm shower or heat pack:

• Pendulum swings: Lean forward, let the arm hang, and swing it gently in small circles — 30 seconds each direction
• Finger walk: Face a wall and 'walk' your fingers up as high as comfortable, hold 10 seconds, repeat 10 times
• Towel stretch: Hold a towel behind your back with both hands; use the good arm to gently pull the affected arm upward
• Cross-body stretch: Bring the affected arm across your chest, support it with the other arm, hold 15–20 seconds
• Armpit stretch: Use the good arm to lift the affected arm onto a shelf at chest height, bend your knees gently to deepen the stretch

When exercises are not enough

If pain prevents sleep or stretching produces no progress over several weeks, additional treatment helps: a corticosteroid injection into the joint (most effective in the freezing stage), hydrodilatation (injecting fluid to stretch the capsule), or — for stubborn cases — arthroscopic capsular release, a keyhole procedure that cuts the tight tissue. Most patients, however, recover without any procedure.