Shoulder Impingement: Causes, Symptoms & Treatment

Shoulder impingement syndrome is one of the most common causes of persistent shoulder pain. It’s one of those conditions that becomes extremely frustrating. 

You might be finding little things starting to become difficult such as:

• Reaching up to a cupboard
• Getting dressed
• Pouring the kettle

It often creeps in gradually. No big injury. No dramatic moment. Just a shoulder that starts to complain. 

Over the years in clinic as a chiropractor in Portsmouth UK (Active Health), I’ve followed many of these injuries along the road to recovery. 

Patients often ask me:

“Is this ever going to get better?”

I’ll be completely honest—the road is often a rocky one. 

The good news… In the majority of cases, they resolve over time. However, they need to be fully understood properly first.

What Is Shoulder Impingement Syndrome?

Shoulder impingement syndrome occurs when tendons and/or subacromial bursa become compressed/irritated in the space at the top of the shoulder during arm movement. 

When this space narrows due to poor movement, posture, muscle imbalance and overload, the tissues become compressed. 

Over time, this leads to inflammation, pain with overhead movement, and reduced shoulder function.

The painful structures are most commonly:

• The supraspinatus tendon (one of the rotator cuff tendons)
• The long head of the biceps tendon.
• The subacromial bursa (this normally protects the tendons but becomes inflamed)

When you raise your arm, several things happen at the same time:

• The humerus rotates
• The shoulder blade upwardly rotates
• The thoracic spine extends slightly

If that coordinated movement is lost, space narrows and the tendons become overloaded.

Over time, that overload produces pain.

It is rarely a single “pinch.”

It is usually repeated mechanical strain.

Common Symptoms of Shoulder Impingement Syndrome

Shoulder impingement syndrome typically develops gradually and worsens with overhead activity. The most common symptoms include:

• Pain when lifting the arm overhead (especially between shoulder height and fully raised)
• Sharp pain with certain movements, particularly reaching or pressing
• Pain when reaching behind your back (e.g. fastening a bra or putting on a coat)
• Discomfort when lying on the affected shoulder, often disturbing sleep
• A dull ache in the outer or front of the shoulder
• Weakness when lifting or rotating the arm
• Reduced range of motion or stiffness
• Pain during repetitive overhead activities (gym, tennis, swimming, manual work)
• Front-of-shoulder pain if the biceps tendon is involved
• A painful arc of movement — discomfort typically felt between 60–120 degrees of arm elevation

What Causes Shoulder Impingement?

1️. Poor Shoulder Blade Mechanics

If the scapula does not rotate efficiently:

• The acromial space reduces
• The rotator cuff works harder
• Irritation develops

Rounded shoulders and thoracic stiffness make this worse.

2. Thoracic Spine (Mid-Back) Stiffness

In my experience, this is where many rehab programs fall short. It is a mistake to only concentrate on the shoulder.

If your mid-back is stiff and flexed:

• The shoulder blade cannot sit properly
• Upward rotation is reduced
• The rotator cuff compensates

The shoulder blade rests on the ribcage.

If the ribcage doesn’t move well, neither does the shoulder. 

Quality movement and adequate strength in the thoracic spine is vital for a proper functioning shoulder

From the outside it might have looked like the weight lifting was the problem. However, the primary cause of the problem was his postural positioning during the day.

3. Repetitive Overhead Load

• Gym pressing
• Swimming
• DIY
• Rapid increases in training intensity

A sudden increase in activity in an already fragile shoulder is a common trigger.

4️. Prolonged Desk Posture (Highly Underestimated)

Eight hours of unsupported arm posture is often the real aggravator.

When your arms hang forward at a desk:

• Upper trapezius overworks
• Anterior shoulder compresses
• Scapular stabilisers fatigue

This is where most cases fail to improve — not because exercises don’t work, but because daily load remains unchanged.

How to Fix Shoulder Impingement (Properly)

Step 1: Reduce Daily Irritation

If you sit most of the day, your environment must support your shoulder.

This is of the utmost importance.

Standing Desks

Alternating sitting and standing reduces sustained forward shoulder posture.

A quality standing desk allows you to:

• Reduce thoracic flexion
• Improve shoulder blade positioning
• Change load every 45–60 minutes

If you’re unsure which model suits your workspace, I’ve listed the standing desks I recommend on my Product Recommendations Page as well as use personally in clinic 

They’re selected based on stability, height range, and long-term usability — not marketing claims. 

Ergonomic Chairs (Arm Support is Critical)

For shoulder impingement, adjustable armrests are essential.

A proper ergonomic chair should provide:

• Height-adjustable armrests
• Lumbar support
• Recline option

Unsupported arms = sustained shoulder muscle load.

Supported arms = reduced irritation.

I’ve outlined the chairs I recommend — particularly those with proper arm support — on my Ergonomic Chair Recommendations Page

If you’re spending 6–8 hours seated, this change alone could make the difference between a shoulder that remains painful and one that is able to recover.

Ergonomic Pillows (Sleep Matters)

Night pain is one of the most frustrating features of shoulder impingement. 

A supportive ergonomic pillow helps:

• Maintain neutral neck alignment
• Prevent forward shoulder collapse
• Reduce overnight irritation

I’ve listed the ergonomic pillow that I recommend on my Products Page. It has a special groove which supports the neck, which helps reduce the load on the shoulder. If you’re lying awake at night, not able to get to sleep, this may be the solution.

Sleep quality directly influences recovery speed.

STEP 2: Restore Movement

Rehabilitation should focus on:

• Scapular control
• Rotator cuff endurance
• Gradual overhead loading
• Thoracic extension strength/mobility

Avoid:

• Aggressive stretching into pain
• Jumping straight back into heavy pressing
• Ignoring mid-back stiffness

Consistency beats intensity.

Exercises That Help Shoulder Impingement Syndrome

The most effective shoulder impingement exercises usually include:

• Scapular retraction work
• Serratus anterior activation
• Rotator cuff endurance drills
• Thoracic mobility exercises

The shoulder rarely improves without addressing the mid-back. Explore my shoulder impingement exercises here

When It Might Not Be Impingement Syndrome

Not all pain is caused by impingement syndrome. Other conditions can present with similar symptoms including:

• Rotator cuff and biceps tendinopathies
• Frozen Shoulder
• Acromioclavicular (AC) joint sprains

If you’re not entirely convinced that your signs and symptoms match those of impingement syndrome, explore the other conditions through the links above for further clarity.

When to Seek Further Help

Seek professional assessment if you experience:

• Sudden weakness after injury
• Inability to lift the arm
• Significant trauma
• Persistent night pain
• Numbness or tingling into the arm
• No improvement after several weeks of structured modification

In some cases, imaging or referral may be appropriate.

If unsure, get assessed properly.

Frequently Asked Questions

How long does shoulder impingement take to heal?

Most cases improve within 6–12 weeks with proper load management and strengthening.

Is shoulder impingement the same as rotator cuff injury?

Impingement often involves rotator cuff irritation but is not always a tear.

Should I stop going to the gym?

Reduce painful movements temporarily, but avoid complete inactivity.

Final Thoughts

Shoulder impingement syndrome does not happen by accident.

It reflects:

• How your thoracic spine moves
• How your shoulder blade functions
• How your daily setup loads your shoulder

Fix the environment.

Restore movement.

Reload progressively.

That is what works long-term.