Shoulder condition
Shoulder Impingement
Also called: Subacromial Impingement
Shoulder impingement happens when a rotator cuff tendon is squeezed or pinched against the bone above it as you lift your arm. The tendon becomes irritated and inflamed, causing pain during overhead movement - a "painful arc" - that usually eases when the arm is lowered. It is one of the most common causes of shoulder pain and often responds well to rehab.
Symptoms
Shoulder impingement usually builds gradually with overhead activity. Common signs include:
- Pain when raising the arm, especially in a mid-range "painful arc"
- Pain that eases once the arm is lowered or fully raised
- Aching at night, particularly lying on the affected side
- Weakness or difficulty with overhead tasks
- Pain reaching behind the back or across the body
- A pinching sensation at the top of the shoulder
Causes
Impingement develops when the space around the cuff tendons narrows or the tendons swell. Common contributors:
- Repetitive overhead activity (painting, swimming, throwing sports)
- Poor posture that narrows the space above the tendons
- Weak rotator cuff or shoulder-blade muscles
- Bone spurs on the underside of the shoulder blade
- Previous shoulder injury or inflammation
- Age-related tendon changes
Impingement vs rotator cuff tear
| Impingement | Rotator cuff tear | |
|---|---|---|
| Tendon | Pinched but intact | Partially or fully torn |
| Weakness | Mild or none | Marked |
| Pain at rest | Eases | Often persists, worse at night |
| Recovery | Rehab, 4–6 weeks | Weeks to months; may need surgery |
What helps shoulder impingement?
Most shoulder impingement settles without surgery. The priority is to rest from overhead movements, calm the inflammation, then strengthen the rotator cuff and improve posture so the tendon stops being pinched. A shoulder pain patch worn over the shoulder gives steady, drug-free relief while the tendon recovers.
- Rest from painful overhead movements while it settles
- Ice after activity to reduce inflammation
- Physiotherapy to strengthen the cuff and shoulder blade
- Improve posture to open up the space above the tendon
- Use drug-free relief - a shoulder pain patch over the shoulder
- Return to overhead activity gradually as pain settles
Frequently asked questions
How long does shoulder impingement take to heal?
Most shoulder impingement improves within four to six weeks of consistent rehab, though stubborn cases can take a few months. Recovery is faster when you rest from the aggravating overhead activity early and stick with rotator cuff and posture exercises. Returning to full overhead training too soon is the most common reason it lingers.
What is the difference between impingement and a rotator cuff tear?
Impingement is a compression problem - the tendon is pinched but intact, so pain comes with overhead movement and settles at rest. A tear is structural: the tendon is partly or fully torn, so weakness sits alongside the pain. The quickest clue is weakness - pain alone suggests impingement, while pain plus lasting weakness suggests a tear.
Should you exercise with shoulder impingement?
Yes - the right exercises are central to recovery. Gentle rotator cuff and shoulder-blade strengthening, guided by a physiotherapist, help open the space around the tendon. Avoid heavy overhead lifting and any movement that reproduces sharp pain while it is settling. Pain-free strengthening is helpful; pushing through a painful arc is not.
Does shoulder impingement go away on its own?
Mild impingement can settle with rest and activity changes, but it often returns if the underlying cause - usually weak cuff muscles or poor posture - is not addressed. That is why strengthening and posture work matter: they treat the reason the tendon was being pinched, not just the current flare-up.
When should you see a doctor?
See a doctor or physiotherapist if shoulder pain lasts more than a few weeks, disrupts sleep, or is not improving with rest and gentle exercise. Seek prompt advice if you develop marked weakness or cannot lift the arm, which can point to a rotator cuff tear rather than simple impingement.
A quick, honest note. This guide is for general education and does not replace a diagnosis from a qualified clinician. mLab makes natural pain-relief patches and support devices - they can ease day-to-day discomfort, but they do not treat or cure this condition. If you develop marked weakness or cannot lift your arm, please see a doctor to rule out a rotator cuff tear.