A snapping shoulder blade (snapping scapula syndrome) is a grinding, clicking, popping or thumping felt or heard as the shoulder blade moves over the back of the ribs. Painless snapping is common and usually harmless. When it hurts, the cause is often an irritated fluid sac (bursa) under the blade, or muscle weakness that changes how the blade glides. Painful snapping usually eases with shoulder blade strengthening and posture work over about 3 to 6 months.
The shoulder blade slides over the rib cage every time you move your arm. Muscles and small fluid-filled sacs (scapulothoracic bursae) let it glide smoothly. If the bursa becomes inflamed and thickened, the muscles cushioning the blade become thin or weak, or the blade sits in a different position, the glide becomes rough. Less often, a bony bump on the blade or rib, or a healed rib fracture, is the cause.
The noise is often loud enough for others to hear. It is most common in people who do repeated overhead work or sport, such as swimmers, throwers and painters, and in people with a rounded upper back.
Key takeaways
- What it is: grinding, clicking or thumping as the shoulder blade moves over the ribs.
- Painless snapping: common and usually harmless.
- Common causes when painful: an irritated bursa under the shoulder blade, muscle weakness or imbalance, and upper back posture.
- Less common causes: a bony bump (such as an osteochondroma) on the blade or rib, or a healed rib fracture.
- Typical course: painful snapping usually eases over 3 to 6 months of strengthening and posture work. Surgery is considered only when this has not helped.
Where are you right now?
- It snaps but does not hurt: read “What tends to set it apart”. Usually no change to your activity is needed.
- Painful and weeks in without change: go to “If it isn’t going to plan”.
- After an injection or surgery: a bursa injection often eases pain for a period that is used to build strength. After surgery, follow your surgeon’s protocol.
- Getting back to work or sport: the “When can I…” table covers overhead work and sport.
What tends to set it apart
- Soft grinding or crepitus, no pain: often normal tissue gliding. Common on both sides.
- Grinding with an ache at the upper inner corner or lower tip of the blade: typical of an irritated bursa. The spot is often tender to press.
- A loud, single clunk at one point in the movement: more often linked to a bony bump or prominence.
- Snapping that improves when you hold the blade back and down: suggests muscle control and position are playing a large part.
Week by week
This applies to painful snapping without a bony cause.
- Weeks 0 to 2: reduce the repeated movement that brings on painful snapping, often overhead reaching or pushing. Keep the shoulder moving in comfortable ranges.
- Weeks 2 to 6: strengthening for the muscles that hold the blade flat and steady (serratus anterior, lower and middle trapezius) usually starts. Upper back mobility exercises are often added.
- Weeks 6 to 12: strengthening progresses toward and above shoulder height. Many people notice the snap becoming quieter or less painful.
- Months 3 to 6: sport and heavy overhead work are built back up. Painful snapping that has not changed by this point is usually reassessed.
The noise matters less than the pain that comes with it.
Where else this could be coming from
- Shoulder joint clicking: clicks from the shoulder joint itself, such as a labral tear or rotator cuff problem, are felt at the front, top or deep in the shoulder rather than under the blade.
- Rib joint irritation: sharp pain beside the spine on breathing or twisting, without grinding as the arm moves.
- Winged shoulder blade: the blade visibly lifts away from the ribs, often with weakness lifting the arm, and may also snap.
- Neck-related pain: an ache along the inner edge of the blade that changes with head movement.
- A lump under the blade: a bony growth or soft-tissue lump can cause snapping and may be felt or seen. This needs imaging.
Is this normal?
- Other people can hear it: common. The rib cage acts like a sounding board, so even harmless snapping can be loud.
- Both sides snap: common, and reassuring when neither side hurts.
- It is worse after a long day at the computer: common. A rounded upper back and tired shoulder blade muscles change how the blade glides.
- Exercises make it snap more at first: mild snapping during exercise is common. Pain that lasts into the next day means the load needs reducing.
If it isn’t going to plan
It is week eight. Every time you reach up to the bathroom cabinet, the blade grinds, and the ache under it lingers through the afternoon. You have been rolling your shoulders backward dozens of times a day to “crack it loose”. The thought in your head is that if you can just make it snap enough, it will free up.
Repeating the snap usually keeps the bursa irritated. Each grind rubs the inflamed tissue again. What usually helps is changing the glide: stronger muscles that hold the blade close to the ribs, a more mobile upper back, and fewer repetitions of the painful movement while the bursa settles.
If painful snapping has not eased after about 3 months of consistent strengthening, get assessed by a physical therapist or doctor. Questions worth asking:
- Is the snapping coming from a bursa, muscle control or bone?
- Would an X-ray, CT or MRI change the plan?
- Which exercises target the muscles that hold my shoulder blade?
- Is an injection worth considering, and how would we use the time it gives?
When can I…
| Activity | Typical range |
|---|---|
| Sleep on that side | Usually possible throughout; if pressure on the blade aches, often eases over 2 to 6 weeks |
| Drive | Usually possible throughout |
| Reach overhead | Short spells usually possible; repeated overhead reaching often built back up over 6 to 12 weeks |
| Lift | Light loads close to the body throughout; heavy pushing and pulling often built up over 6 to 12 weeks |
| Desk work | Usually possible throughout, with a change of position every 30 to 45 minutes |
| Manual work or sport | Overhead sports such as swimming or throwing often 3 to 6 months when snapping is painful |
If you have had surgery, your surgeon’s protocol comes first.
Call your local emergency number or go to the emergency department if
- Chest symptoms: shoulder blade pain with chest pain, pressure, breathlessness, sweating or nausea.
- Major injury: severe pain, deformity or inability to move the arm after a fall or collision.
See a doctor today if
- Hot, swollen area: redness, heat or swelling over the shoulder blade, or a fever.
- Sudden weakness: new weakness lifting the arm, or the blade suddenly sticking out.
Get it checked soon if
- A lump: you can feel or see a lump on or under the shoulder blade.
- Growing pain: pain under the blade that is increasing, or present at night.
- After a rib injury: snapping that began after a rib fracture or chest injury.
- No change: painful snapping has not eased after about 3 months of exercise.
More on this area: upper and mid back conditions.
A shoulder blade that snaps without pain is usually just moving, and one that snaps with pain usually responds to a better glide.
Written by Louise Yow, Neck & Shoulder Physio.