Subacromial Bursitis

Subacromial bursitis is a condition involving inflammation of the subacromial bursa, a fluid-filled sac located beneath the acromion at the top of the shoulder. This inflammation can cause shoulder pain, restricted arm movement and discomfort during everyday activities, particularly those involving lifting or reaching overhead.

Often associated with shoulder impingement and rotator cuff problems, subacromial bursitis may develop gradually from repetitive strain or occur following an injury. Understanding its causes, symptoms and available treatment options can help you take appropriate steps towards recovery.

What Is Subacromial Bursitis?

The subacromial bursa is a fluid-filled structure situated beneath the acromion, a bony projection of the shoulder blade that forms the roof of the shoulder.

It lies between the acromion and the rotator cuff tendons, helping reduce friction as the arm is raised, lowered or rotated.

The bursa also extends beneath the deltoid muscle and is commonly referred to as the subacromial-subdeltoid bursa (SA-SD bursa).

Under normal circumstances, this protective cushioning allows the rotator cuff tendons to glide smoothly beneath the acromion during shoulder movement.

When the bursa becomes irritated or inflamed, it may thicken or accumulate excess fluid. This can contribute to pain and discomfort, particularly when lifting the arm or performing movements that place additional stress on the structures within the subacromial space.

Subacromial bursitis is a common contributor to shoulder pain and may occur alongside other conditions affecting the rotator cuff.

What Are the Symptoms of Subacromial Bursitis?

Symptoms can develop gradually or appear following an injury. The severity of discomfort varies depending on the extent of inflammation and whether other shoulder structures are affected.

Common symptoms include:

• Pain when lifting the arm: Discomfort or a sharp, pinching sensation when raising the arm, particularly during overhead movements.

• Pain along the outer shoulder: An aching sensation that may extend down the upper arm, sometimes towards the elbow.

• Painful arc of movement: Increased discomfort when lifting the arm through certain angles, often between approximately 60 and 120 degrees.

• Night-time shoulder pain: Difficulty sleeping, particularly when lying on the affected shoulder.

• Restricted shoulder movement: Discomfort or difficulty when reaching overhead, putting on clothing or reaching behind the back.

• Shoulder weakness: Reduced strength or difficulty lifting and carrying objects, sometimes because pain limits normal movement.

Unlike bursitis affecting more superficial joints, swelling associated with subacromial bursitis is generally not visible externally because the bursa is located deep within the shoulder.

What Causes Subacromial Bursitis?

Subacromial bursitis generally develops when the bursa is repeatedly irritated or subjected to excessive mechanical stress.

Several factors can contribute to the condition.

Repetitive Overhead Activities

Repeatedly lifting the arms above shoulder height can place additional stress on the rotator cuff tendons and surrounding bursa.

Activities such as painting, gardening, swimming, household maintenance and certain recreational sports may contribute to irritation over time.

Shoulder Impingement

Subacromial bursitis is frequently associated with shoulder impingement, a condition in which the tissues beneath the acromion become irritated during shoulder movement.

Factors such as rotator cuff dysfunction, local inflammation and changes in shoulder mechanics may contribute to this irritation.

Rotator Cuff Injuries

The subacromial bursa lies immediately above the rotator cuff tendons. Tendinopathy, tendon irritation or rotator cuff tears may occur alongside inflammation of the bursa.

Bone Spurs and Acromion Shape

Age-related bone changes, including the development of bone spurs beneath the acromion, may contribute to irritation of the surrounding tissues.

Variations in the natural shape of the acromion may also influence the available space for shoulder movement, although these anatomical features do not necessarily cause symptoms.

Direct Injury or Trauma

A fall onto the shoulder, sudden impact or excessive strain may trigger inflammation within the subacromial bursa.

Age-Related Degeneration

Changes affecting the shoulder tendons and surrounding structures become more common with age and may increase susceptibility to shoulder pain and inflammation.

Subacromial Bursitis and Shoulder Impingement – What's the Difference?

Subacromial bursitis and shoulder impingement are closely related but are not exactly the same condition.

Subacromial bursitis specifically describes inflammation of the fluid-filled bursa beneath the acromion.

Shoulder impingement, often discussed within the broader category of subacromial pain syndrome, describes pain associated with the tendons and other tissues occupying the space beneath the acromion.

These conditions frequently occur together because the bursa and rotator cuff tendons are located in close proximity.

However, not all shoulder impingement symptoms are caused by bursitis, and subacromial bursitis can occur without a clear mechanical impingement problem.

Identifying the underlying cause is important for selecting an appropriate treatment and rehabilitation program.

How Is Subacromial Bursitis Diagnosed?

A healthcare professional will generally begin by reviewing your symptoms, medical history and the activities that aggravate your shoulder.

A physical examination may assess shoulder tenderness, muscle strength, range of motion and pain during specific movements.

In some cases, further investigations may be recommended.

Ultrasound

An ultrasound scan can help identify thickening or fluid accumulation within the subacromial bursa and assess the surrounding rotator cuff tendons.

MRI Scan

Magnetic resonance imaging may be recommended when a more detailed assessment of the shoulder's soft tissues is required, particularly if a rotator cuff injury is suspected.

X-rays

Although X-rays do not directly show bursal inflammation, they can help identify bone spurs, arthritis or other structural changes that may contribute to shoulder symptoms.

Because subacromial bursitis can produce symptoms similar to rotator cuff injuries, frozen shoulder and other shoulder disorders, an accurate diagnosis is important before beginning treatment.

What Are the Treatment Options for Subacromial Bursitis?

Treatment generally focuses on reducing irritation, managing inflammation and restoring comfortable shoulder movement.

The most appropriate approach depends on the severity of symptoms, the underlying cause and whether other shoulder structures are affected.

Activity Modification and Rest

Reducing activities that repeatedly aggravate the affected shoulder is often an important first step.

Avoid heavy lifting, repetitive overhead movements and activities that cause significant pain, particularly during the early stages of inflammation.

Everyday activities such as reaching into overhead cupboards, gardening or carrying heavy shopping bags may need to be temporarily modified.

However, completely immobilising the shoulder is generally discouraged, as prolonged inactivity can contribute to stiffness and muscle weakness.

Gentle, comfortable movement may help maintain mobility while the inflammation settles.

Heat Therapy

Applying a warm compress or heat pack to the affected shoulder for 15–20 minutes at a time may help relax tight muscles, ease stiffness and improve comfort during shoulder movement.

Heat therapy is generally more suitable for ongoing stiffness or discomfort rather than a recent injury or acute inflammation, where heat may aggravate swelling.

Always wrap heat packs in a towel and avoid applying excessive heat directly to the skin.

Physiotherapy and Rehabilitation

During the initial stages of subacromial bursitis, strenuous physiotherapy exercises and strengthening activities that aggravate shoulder pain should generally be avoided or modified, as they may further irritate the inflamed bursa and worsen symptoms.

Gentle shoulder movements and appropriately supervised exercises may still be beneficial to help maintain mobility and prevent stiffness.

As the inflammation and associated pain begin to settle, a gradual rehabilitation program can be introduced.

Physiotherapy can then play an important role in:

• Restoring normal shoulder mobility and range of motion.

• Rebuilding strength in the rotator cuff and surrounding shoulder muscles.

• Addressing muscle weakness or atrophy caused by reduced activity.

• Improving shoulder stability and movement patterns.

• Reducing the likelihood of recurring shoulder problems.

A progressive rehabilitation program should be tailored to the individual's symptoms and recovery, avoiding exercises that cause significant or lasting aggravation.

Pain Relief and Anti-Inflammatory Medication

Depending on the severity of symptoms, a healthcare professional may recommend appropriate pain-relieving or anti-inflammatory medication.

Non-steroidal anti-inflammatory drugs (NSAIDs) may help manage pain and inflammation, although they are not suitable for everyone.

In some cases, a corticosteroid injection into the subacromial region may be considered when symptoms remain particularly troublesome.

These treatments require appropriate medical assessment, and injections do not necessarily address the underlying factors contributing to the condition.

Drug-Free Home Treatment Options

Some people also explore drug-free, non-invasive home treatment options to help manage swelling and associated discomfort.

These approaches may be considered alongside appropriate rest, activity modification and rehabilitation, rather than as substitutes for medical assessment or necessary treatment.

Managing Subacromial Bursitis with OSMO Patch

The OSMO Patch offers a drug-free, non-invasive home treatment option designed to help reduce swelling and associated pain from shoulder bursitis.

Designed around two complementary mechanisms of action, the patch uses far-infrared wavelengths to help stimulate localized blood flow, while osmosis helps draw excess fluid away from the affected area.

Used alongside appropriate rest and activity modification, OSMO Patch provides a convenient, more natural approach to managing shoulder bursitis, including subacromial bursitis.

>> Learn More about OSMO Patch for Drug-Free Shoulder Bursitis Relief

How Long Does Subacromial Bursitis Take to Heal?

Recovery times vary depending on the severity of inflammation, the underlying cause and whether other shoulder structures are affected.

Some people experience noticeable improvement within several weeks of modifying aggravating activities and following an appropriate treatment plan.

However, more persistent cases may take several months to improve, particularly when rotator cuff problems, repetitive strain or ongoing shoulder irritation are involved.

Continuing to perform activities that aggravate the affected shoulder may prolong symptoms and delay recovery.

As pain and inflammation settle, gradually restoring shoulder mobility and muscle strength can help support longer-term recovery.

If symptoms persist, worsen or continue interfering with everyday activities, further medical assessment is recommended.

Frequently Asked Questions About Subacromial Bursitis

Is Subacromial Bursitis the Same as Shoulder Bursitis?

Subacromial bursitis is a specific form of shoulder bursitis affecting the bursa beneath the acromion. The general term shoulder bursitis may also refer to inflammation affecting other bursae around the shoulder.

What Is the Difference Between Subacromial and Subdeltoid Bursitis?

Subacromial bursitis refers to inflammation of the portion of the bursa beneath the acromion, while subdeltoid bursitis refers to the portion extending beneath the deltoid muscle.

Because these regions generally form one continuous structure, they are commonly grouped under the term subacromial-subdeltoid bursitis.

Can Subacromial Bursitis Cause Pain Down the Arm?

Yes. Pain associated with subacromial bursitis is often felt along the outer shoulder and may extend down the upper arm towards the elbow.

However, pain extending further down the arm, particularly when accompanied by numbness or tingling, may indicate another condition requiring medical assessment.

Can Subacromial Bursitis Cause Pain at Night?

Yes. Night-time shoulder pain is a common complaint, particularly when lying directly on the affected shoulder.

Sleeping on the opposite side or supporting the affected arm with a pillow may help reduce discomfort.

Can Subacromial Bursitis Heal Without Surgery?

Many cases improve with conservative treatment, including activity modification, appropriate rehabilitation and pain management.

Surgery is not generally required for uncomplicated subacromial bursitis, although persistent symptoms or associated structural problems may require specialist assessment.

Should I Exercise with Subacromial Bursitis?

Activities and exercises that significantly aggravate shoulder pain should be avoided or modified during an active flare-up.

However, gentle shoulder movement and appropriately guided rehabilitation may help maintain mobility and prevent muscle weakness.

As symptoms improve, gradual strengthening exercises can help restore shoulder function and support longer-term recovery.

Is Heat Good for Subacromial Bursitis?

Heat therapy may help ease muscle tension and shoulder stiffness, particularly when symptoms are ongoing.

However, applying heat immediately following an acute injury or during significant active swelling may aggravate symptoms.

Can Subacromial Bursitis Come Back?

Yes. Symptoms may recur if the underlying factors contributing to irritation remain unresolved.

Repeated overhead activities, rotator cuff weakness, poor shoulder mechanics and returning too quickly to aggravating activities may increase the likelihood of recurring discomfort.

When Should You Seek Medical Attention?

Seek medical advice if shoulder pain persists, worsens or significantly restricts your ability to perform everyday activities.

Urgent medical assessment is appropriate if you experience severe shoulder pain following an injury, an inability to move the arm, pronounced swelling, fever or new numbness or loss of sensation.