Subacromial bursitis
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
Irritation of the small fluid-filled cushion above the rotator cuff. It is a common source of shoulder pain and often calms with treatment.
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Where you'll see this
This wording turns up on Shoulder MRI reports — MRI imaging of the shoulder. A shoulder MRI shows the rotator cuff muscles and tendons, the labrum (the cartilage rim of the socket), the biceps tendon, the joint surfaces, and the surrounding bones. Doctors order it for shoulder pain, weakness, limited movement, or after an injury. Some changes, like mild tendon wear, are common with age and may not fully explain symptoms — your doctor connects the images to your exam.
Questions worth asking your doctor
- Do the MRI findings explain the pain or weakness I feel?
- Is any finding likely age-related rather than from a recent injury?
- What are my options, including physical therapy and other non-surgical care?
- If there is a tear, does it need surgery or can it be managed conservatively?
- Do I need any follow-up, and when?
How common is this?
Subacromial bursitis, inflammation of the small fluid-filled cushion under the top of the shoulder bone, is one of the most common causes of shoulder pain and very frequently accompanies rotator cuff tendinopathy since the two structures sit right next to each other. It often develops from repetitive overhead activity or minor impingement.
When should I worry?
Isolated bursitis is rarely serious and typically responds well to conservative treatment. Warmth, redness, fever, or a shoulder that is dramatically more painful than usual can indicate an infected bursa, which is uncommon but needs prompt medical attention.
What happens next
Most cases improve within a few weeks with rest, anti-inflammatory medication, and physical therapy aimed at improving shoulder mechanics. A steroid injection into the bursa is a common and effective next step for cases that don't settle with initial conservative care.
Frequently asked questions
- Is bursitis the same as a rotator cuff tear?
- No, bursitis involves inflammation of a fluid sac that cushions the tendons, while a tear involves the tendon fibers themselves. The two often occur together and can be hard to tell apart by symptoms alone, which is why imaging helps.
- What activities make bursitis worse?
- Repetitive overhead reaching, lifting, and sleeping on the affected shoulder tend to aggravate subacromial bursitis. Modifying these activities during a flare-up while continuing gentle motion usually speeds recovery.
- How long does shoulder bursitis take to heal?
- Most mild to moderate cases improve within two to six weeks with conservative treatment, though it can take longer if there's an underlying mechanical cause like impingement. Recurrent bursitis is worth discussing with a doctor to address the root cause.
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