Suprascapular Nerve Entrapment: Back of Shoulder Pain

Suprascapular nerve entrapment is pressure on, or repeated stretching of, the nerve that runs across the top of the shoulder blade to two rotator cuff muscles. It usually causes a deep, dull ache at the back or top of the shoulder and weakness turning the arm outward or lifting it to the side. Sometimes there is little pain, just weakness and a hollow over the back of the shoulder blade. It is more common in volleyball players and other overhead athletes.

The suprascapular nerve comes from the C5 and C6 nerve roots in the neck, part of the brachial plexus. It passes through a notch at the top of the shoulder blade to supply the supraspinatus and infraspinatus muscles, then curves around a second notch behind the shoulder socket to reach the infraspinatus alone. Where the nerve is caught changes which muscles weaken.

Key takeaways

What it is: suprascapular nerve entrapment is pressure or stretch on the nerve to the supraspinatus and infraspinatus muscles.
Symptoms: a deep ache at the back or top of the shoulder, weakness turning the arm outward, and sometimes a visible hollow over the shoulder blade.
Common causes: repeated overhead movements such as the volleyball serve, and fluid-filled cysts that can form next to a labral tear.
Diagnosis: nerve studies and an MRI scan are usually needed to confirm it and look for a cyst.
Recovery: without a cyst, most people are treated without surgery first, and recovery often takes 6 to 12 months.

Where are you right now?

You have just noticed it: an ache at the back of the shoulder, a weaker serve or throw, or a hollow someone pointed out. Read “Where else this could be coming from” and get assessed.
Months in and not settling: go to “If it isn’t going to plan”.
A cyst has been found or surgery is planned: cysts are often drained or removed with the labral tear repaired at the same time. If keyhole surgery is planned, preparing for shoulder arthroscopy covers the run-up.
Getting back to sport: the guide to volleyball shoulder pain covers serving and spiking load. The “When can I…” table below gives typical ranges.

Month by month

Weeks 0 to 6: the aim is to cut back the movements that load the nerve, often hard serving, spiking or throwing, while keeping the shoulder moving. Nerve studies and an MRI are often done in this window.
Months 2 to 3: exercises focus on shoulder blade control and gentle rotator cuff work. The ache often eases before strength returns.
Months 3 to 6: strength usually builds slowly. Sport-specific drills are added in stages if the shoulder tolerates them.
Months 6 to 12: many people improve over this period. Some muscle thinning can remain even when the shoulder works well.
After surgery: recovery follows the surgeon’s plan, often 3 to 6 months back to overhead sport and longer for strength to rebuild fully.

Where else this could be coming from

Rotator cuff tear: a torn rotator cuff weakens the same movements. It more often follows a fall or builds up with age, and an MRI usually tells the two apart.
Labral tear: a labral tear tends to cause clicking, catching and pain with overhead or throwing movements. It can also be the source of the cyst that presses on the nerve.
Pinched nerve in the neck: a C5 or C6 pinched nerve in the neck can weaken these muscles too, but usually also brings neck pain, tingling toward the thumb, and weakness in the deltoid or biceps.
Rotator cuff tendinopathy: rotator cuff tendinopathy causes pain with load at the side of the shoulder; strength is often limited by pain rather than lost.
Inflamed nerves: brachial neuritis can affect the same nerve. It typically starts with days of severe pain, then weakness as the pain fades.
Other spots: pain at the back of the shoulder has several other sources, set out in shoulder pain by location.

A shoulder can lose strength quietly, so weakness without much pain still deserves a look.

Is this normal?

It hardly hurts but it is weak: this is common when the nerve is caught behind the shoulder socket, where it carries mostly movement signals.
There is a hollow on my shoulder blade: thinning of the infraspinatus muscle is a recognized sign. It can take many months to fill out, and some thinning may remain.
The ache spreads toward my neck or arm: the ache from this nerve is often vague and hard to pinpoint.
I can still play: many athletes keep playing with this, because other muscles compensate. That is worth discussing with whoever assesses you, since load changes are usually part of recovery.

If it isn’t going to plan

It is month three. You still reach back for the seatbelt with the other hand, and your serve lands short. It does not hurt much, so the thought in your head is: it will sort itself out if I keep playing through it.

The belief that is failing is “no pain means no problem.” A nerve under repeated stretch or pressure can keep losing signal without much pain. Strength usually returns once that stretch or pressure eases, and the muscles that steady the shoulder blade change how much the nerve is pulled with each swing. If a cyst is pressing on it, the cyst may need treating.

Get assessed by a physical therapist or sports doctor. Ask where along the nerve the problem is likely to be, whether a nerve study or MRI is needed, which movements to cut back and for how long, how progress will be measured, and when surgery would be considered.

When can I…

Activity	Typical range
Sleep on that side	Often possible throughout; if the ache wakes you, usually within a few weeks of reducing load
Drive	Usually unaffected, once you can turn the wheel comfortably
Reach overhead	Everyday reaching is often fine; repeated overhead loading usually waits until strength returns, often 3 to 6 months
Lift	Light loads close to the body early; heavier and overhead loads built up over 3 to 6 months
Desk work	Usually unaffected
Manual work or sport	Often 3 to 6 months of modified training; full overhead sport may take 6 to 12 months

If you have had surgery, your surgeon’s protocol comes first.

Call your local emergency number or go to the emergency department if

Heart signs: shoulder pain with chest pain, breathlessness or sweating.
Injury: severe pain or a change in the shoulder’s shape after a fall or collision.
Circulation: the arm turns cold, pale or blue, or swells suddenly.

See a doctor today if

Sudden weakness: you suddenly cannot lift or turn the arm out after an injury.
Spreading symptoms: numbness or weakness is spreading down the arm.
Fever: shoulder pain with fever, or a hot, swollen shoulder.

Get it checked soon if

Hollow: a hollow is appearing over the back of the shoulder blade.
Weakness: turning the arm outward has been weak for more than two to three weeks.
Ache: a deep ache at the back of the shoulder is not easing after about two weeks of lighter training.
Both sides: weakness is present in both shoulders.