A cortisone injection for shoulder bursitis may help reduce short-term pain when inflammation limits reaching, lifting, sleep, or rehabilitation. It does not repair tendon damage. Instead, it may create a window of comfort so you can restart movement and progress shoulder strengthening.

Shoulder pain from shoulder bursitis, shoulder impingement, or a rotator cuff injury can make everyday tasks difficult. If early care has not settled your pain, your physiotherapist may discuss whether a shoulder cortisone injection is worth considering with your doctor.

What Is a Cortisone Injection in the Shoulder?

A cortisone injection in the shoulder is an anti-inflammatory treatment that usually combines corticosteroid medication with local anaesthetic. For rotator cuff-related shoulder pain, the injection commonly targets the subacromial bursa to reduce irritation and improve movement comfort.

This diagram shows where cortisone is typically injected to reduce shoulder inflammation.

The injection does not fix the underlying cause of pain. It may help reduce inflammation enough to allow a better response to rotator cuff tear rehabilitation, shoulder mobility work, and strength progression.

When Should You Consider a Cortisone Injection for Shoulder Bursitis?

You may consider a cortisone injection for shoulder bursitis when pain remains high despite appropriate early non-surgical care, including guided rehabilitation. It is most useful when pain blocks sleep, movement, or the ability to complete your rehabilitation exercises.

• Shoulder pain severely restricts reaching or lifting.
• Night pain affects sleep.
• Inflammation prevents exercise progression.
• Symptoms have not improved with appropriate early care.
• A doctor or physiotherapist has confirmed that injection timing is appropriate.

Which Shoulder Conditions May Respond?

Shoulder injections may be considered for inflammatory pain linked to the subacromial bursa or rotator cuff region. They are not suitable for every shoulder problem, so accurate assessment matters.

• Shoulder bursitis
• Subacromial impingement
• Persistent rotator cuff irritation
• Pain that blocks rehabilitation progress
• Some cases of rotator cuff-related shoulder pain

Are Shoulder Cortisone Injections Safe?

Shoulder cortisone injections are generally considered safe when used carefully, infrequently, and in the right tissue. Clinicians usually avoid injecting directly into tendons because corticosteroids may affect tendon structure, especially when injections are repeated.

Ultrasound guidance may improve injection accuracy and short-term pain outcomes where available. However, injection should not replace active rehabilitation for rotator cuff tendinopathy.

What Happens During the Injection?

Your doctor will usually clean the skin, then guide a small needle into the bursa or joint space. The injection may include corticosteroid medication and local anaesthetic. Some people notice short-term numbness from the anaesthetic before the anti-inflammatory effect builds over several days.

After the injection, you may be advised to rest the shoulder briefly before gradually restarting your rehabilitation program. Your physiotherapist can guide safe exercise timing based on your pain, movement, strength, and goals.

Why Rehabilitation Still Matters After Injection

The 2025 JOSPT clinical practice guideline supports active rehabilitation as the initial treatment for rotator cuff tendinopathy. Corticosteroid injections may help reduce pain and short-term disability, but they should not be used as first-line care.

A shoulder cortisone injection works best when paired with structured physiotherapy. Once pain settles, your program should target shoulder strength, scapular control, movement quality, load tolerance, and the activities that matter most to you.

Your rehabilitation plan may include:

• rotator cuff strengthening
• scapular control exercises
• thoracic and shoulder mobility work
• graded return to lifting, work, gym, or sport
• activity modification to reduce flare-ups

Do Cortisone Injections Fix Rotator Cuff Tears?

No. Cortisone injections may reduce pain, but they do not repair torn tendon fibres. Rotator cuff tears need a structured strengthening plan, and larger or worsening tears may require further medical review.

If you have ongoing weakness, loss of function, or pain after a shoulder injury, your physiotherapist may recommend further assessment. This may include medical imaging or review with your GP or sports physician.

Risks and Limitations of Shoulder Cortisone Injections

Most people tolerate shoulder cortisone injections well, but side effects can occur. Risk depends on your health, injection location, dose, frequency, and tendon condition.

• temporary pain flare for 24–48 hours
• skin thinning or lightening near the injection site
• rare infection risk
• temporary blood sugar rise in people with diabetes
• possible tendon weakening with repeated injections

When Should You Seek Professional Advice?

Seek professional advice if shoulder pain limits work, sport, sleep, or daily tasks. A physiotherapist can assess your shoulder movement, strength, irritability, and likely pain source before helping you decide whether rehab alone, medical review, or injection discussion is the next step.

Related Shoulder Information

• Shoulder pain conditions
• Rotator Cuff Injury
• Rotator Cuff Tears
• Shoulder Bursitis
• Shoulder Impingement
• Shoulder Pain FAQs

Common Questions About Shoulder Cortisone Injections

Is a cortisone injection for shoulder bursitis safe?

A cortisone injection for shoulder bursitis is generally considered safe when used carefully, placed accurately, and limited in frequency. Clinicians usually avoid injecting directly into tendons because repeated corticosteroid exposure may affect tendon strength.

How long does a shoulder cortisone injection last?

Pain relief may last from several weeks to a few months. Results vary depending on the condition, injection accuracy, activity load, tendon health, and whether the person completes a structured rehabilitation program.

Where is cortisone injected for shoulder bursitis?

For shoulder bursitis, cortisone is commonly injected into the subacromial bursa. Ultrasound guidance may help improve accuracy and reduce the chance of injecting into nearby tissues such as the rotator cuff tendon.

Can cortisone repair a rotator cuff tear?

No. Cortisone may reduce pain and inflammation, but it does not repair torn tendon fibres. Rotator cuff tears usually need progressive strengthening, load management, and sometimes further medical review.

Should you rest after a shoulder cortisone injection?

Most people are advised to rest the shoulder briefly after a cortisone injection, then gradually restart movement and physiotherapy exercises. Your clinician should guide timing based on your symptoms and injection details.

What to Do Next

If shoulder pain has not settled, book a physiotherapy assessment. Your physiotherapist can help identify the likely pain source, guide your rehabilitation, and discuss whether a cortisone injection for shoulder bursitis may be appropriate as part of your broader recovery plan.

References

1. van Doorn P, et al. Corticosteroid injections for shoulder pain: clinical considerations and safety. 2021.
2. Puzzitiello RN, et al. Adverse impact of corticosteroids on rotator cuff tendon health and repair. Arthroscopy. 2020.
3. Goulart CR, et al. Effectiveness of subacromial corticosteroid injections for rotator cuff-related shoulder pain. BMJ Open. 2022.
4. Desmeules F, et al. Rotator cuff tendinopathy: clinical practice guideline. J Orthop Sports Phys Ther. 2025.
5. ElMeligie MM, et al. Ultrasound-guided subacromial bursal injection outcomes for shoulder pain. 2022.