Shoulder Impingement Syndrome
Pinching of the rotator cuff tendons at the top of the shoulder
Quick Facts
- Type: Musculoskeletal (shoulder) condition
- Main symptom: Pain when raising or reaching with the arm
- Common in: Overhead athletes and manual workers
- Usual treatment: Rest, physical therapy, anti-inflammatories
Overview
Shoulder impingement syndrome occurs when the tendons of the rotator cuff, along with a small fluid-filled sac called the bursa, become compressed in the narrow space beneath the bony tip of the shoulder blade (the acromion). Each time the arm is lifted, these soft tissues can rub or catch against the bone, leading to irritation, inflammation, and pain.
The condition is one of the most common causes of shoulder pain, especially in people who perform repeated overhead movements. With rest, activity changes, and rehabilitation, most cases improve without surgery, though persistent impingement can contribute to longer-term rotator cuff problems if left unaddressed.
Symptoms
Symptoms usually develop gradually and worsen with overhead or reaching activity.
- Pain at the front or outer side of the shoulder when raising the arm
- A painful arc of movement, often between shoulder height and overhead
- Pain that worsens at night, especially when lying on the affected side
- Weakness or difficulty lifting the arm
- Aching that may extend down the side of the upper arm
Pain that follows a sudden injury, or weakness so severe you cannot lift the arm at all, may indicate a rotator cuff tear and should be evaluated.
Causes
Impingement develops when the space beneath the acromion narrows or the tendons within it become swollen. Contributing causes include:
- Repetitive overhead use: Swimming, throwing, painting, or overhead lifting that irritates the tendons over time.
- Tendon swelling (tendinitis) or bursitis: Inflammation that reduces the available space.
- Bone spurs: Small bony growths on the acromion that crowd the tendons.
- Shoulder blade or posture problems: Poor mechanics that change how the shoulder moves.
Risk Factors
- Sports involving overhead motion, such as swimming, tennis, and baseball
- Occupations requiring repeated reaching or lifting overhead
- Increasing age and natural wear of the tendons
- Previous shoulder injury
- Muscle imbalance or weak shoulder-stabilizing muscles
Diagnosis
Diagnosis is usually clinical, based on history and examination:
- Physical exam: The doctor moves the arm through specific positions to reproduce the pinching pain and assess strength.
- Imaging: X-rays can show bone spurs or anatomy of the acromion; ultrasound or MRI may be used if a rotator cuff tear is suspected or symptoms do not improve.
Treatment
Most people improve with conservative care over several weeks to months.
- Activity modification: Avoiding or reducing overhead movements that trigger pain while staying gently active.
- Physical therapy: Exercises to strengthen the rotator cuff and shoulder-blade muscles and restore normal movement; this is the cornerstone of recovery.
- Pain relief: Nonsteroidal anti-inflammatory drugs and ice to reduce pain and swelling.
- Corticosteroid injection: Sometimes used to calm severe inflammation so therapy can progress.
- Surgery: Considered only when symptoms persist despite thorough rehabilitation, to create more space for the tendons or repair a torn cuff.
Prevention
- Warm up and stretch before overhead activity or sport
- Strengthen the rotator cuff and shoulder-blade muscles regularly
- Use proper technique in sports and when lifting
- Increase training intensity gradually rather than suddenly
- Maintain good posture to keep the shoulder space open
When to See a Doctor
See a doctor if shoulder pain lasts more than a few weeks, disturbs your sleep, or limits everyday activities. Seek prompt evaluation if you cannot lift your arm, the shoulder is significantly weak after an injury, or the joint appears deformed, as these can signal a rotator cuff tear or other injury needing specific treatment.
Frequently Asked Questions
How long does shoulder impingement take to heal?
Many people improve within a few weeks to a few months with rest and physical therapy. Recovery depends on how long symptoms have been present and whether the tendons are inflamed or torn, so consistency with exercises is important.
Should I keep exercising with shoulder impingement?
Gentle, guided exercise usually helps, but you should avoid the overhead movements that trigger sharp pain. A physical therapist can show you safe strengthening and mobility exercises that promote healing without aggravating the shoulder.
Is shoulder impingement the same as a rotator cuff tear?
No, but they are related. Impingement is pinching and irritation of the rotator cuff tendons, while a tear is actual damage to the tendon. Long-standing impingement can contribute to tears over time.
Can shoulder impingement go away on its own?
Mild cases can settle with rest and activity changes, but persistent or recurring pain usually responds best to structured physical therapy. Ignoring ongoing symptoms can allow the problem to worsen.
Do I need surgery for shoulder impingement?
Most people do not. Surgery is generally reserved for cases that do not improve after several months of dedicated rehabilitation, or when imaging shows a significant tear or bone spur.
References
- American Academy of Orthopaedic Surgeons (OrthoInfo). Shoulder Impingement/Rotator Cuff Tendinitis.
- Mayo Clinic. Rotator cuff injury — Symptoms and causes.
- MedlinePlus, U.S. National Library of Medicine. Rotator cuff problems.
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Shoulder Problems.