Frozen shoulder injections: options, evidence and recovery

Frozen shoulder (adhesive capsulitis) is one of the most stubborn shoulder conditions, and one where a well-timed injection genuinely earns its place. Here's what the injection options are, what the evidence says about when they help, and what to expect.

What is frozen shoulder?

Frozen shoulder happens when the capsule surrounding the shoulder joint becomes inflamed, thickened, and tight. The result is a distinctive combination: pain (often severe, often worse at night) plus a progressive loss of movement in all directions. Reaching behind your back and turning the arm outwards usually go first. It most commonly affects people between 40 and 60, and is more common in people with diabetes or thyroid conditions, and after a period of shoulder immobilisation.

1Freezing

Pain dominates and stiffness builds. Often 2–9 months. This is where injections help most.

2Frozen

Pain eases but stiffness peaks. Often 4–12 months. Rehab focus shifts to restoring movement.

3Thawing

Movement gradually returns. Can take months to years. Strength work consolidates recovery.

The injection option

Corticosteroid injection

A steroid and local anaesthetic injection placed into the shoulder joint using precise anatomical landmarks. Research suggests corticosteroid injection gives meaningful pain relief in frozen shoulder, and works best early, in the painful, freezing stage. Studies also indicate that injection combined with physiotherapy tends to beat either treatment alone, which is exactly how it's used here. (For how guided injections work generally, see our guided injections guide.)

Hydrodilatation (a larger-volume capsule-stretching injection) isn't offered here: it requires imaging guidance to perform safely. If it's ever the better option for your presentation, you'll be told honestly and referred appropriately.

The honest summary: no injection cures frozen shoulder. The condition runs its own course. What a well-timed injection does is switch off enough pain to sleep, function, and actually do the rehabilitation that protects and restores movement while the shoulder recovers.

What happens at your appointment

Assessment. History and examination to confirm frozen shoulder and rule out look-alikes (rotator cuff problems, arthritis, referred neck pain).
Consent. The relevant anatomical landmarks are identified; risks, benefits and alternatives are talked through properly.
Injection. Steroid and local anaesthetic delivered into the joint using precise anatomical landmarks.
The plan. A staged rehabilitation programme matched to your stage, gentle mobility early and progressive stretch and strength as irritability settles, plus a written report.

Risks and side effects

The same as guided steroid injections generally: a temporary pain flare for a day or two, facial flushing, possible skin changes at the site, a short-term blood sugar rise in people with diabetes, and a small infection risk. These are weighed against the substantial impact of unmanaged frozen shoulder pain, and discussed openly before anything happens.

What does it cost?

£195 Guided injection includes the assessment, the injection itself, and a written report. Self-funded; no GP referral required.

Frequently asked questions

Will an injection cure my frozen shoulder?

No single treatment cures frozen shoulder. It follows its own course over months to years. What a corticosteroid injection reliably does, especially in the early painful stage, is reduce pain enough to sleep, function, and do the rehabilitation that restores movement.

When is the best time to have a frozen shoulder injection?

Evidence suggests corticosteroid injection helps most in the early, painful (freezing) stage, ideally within the first few months of symptoms. In later, stiffness-dominant stages, injections tend to add less and rehabilitation matters more.

How long does frozen shoulder take to get better?

Typically anywhere from several months to two or three years across its freezing, frozen, and thawing stages. Good management doesn't necessarily shorten the overall course, but it substantially reduces pain and keeps you functioning while it resolves.

Do I need a scan before a frozen shoulder injection?

Frozen shoulder is usually diagnosed clinically, from your history and examination, which is how the injection is guided too. An X-ray is sometimes used to exclude arthritis of the shoulder joint.

This guide is general information written by a physiotherapist, not a substitute for individual assessment. Shoulder pain has many causes. If yours isn't improving, get it assessed properly.