Lower Trapezius
The rhomboids run from the spine to the inner border of the shoulder blade and pull the blades together. Their documented pattern is a superficial, concentrated ache along the inner edge of the shoulder blade that does not change much with movement and persists at rest.
Attachments and action
Origin: The spinous processes of T4 through T12.
Insertion: The medial border of the scapula, from the spine of the scapula to the inferior angle.
Action: Depression and upward rotation of the scapula — the postural anchor that keeps the shoulder blade seated as the arm rises.
Where the pain is felt: TrP3 refers a deep ache to the suprascapular region above the spine of the blade and to the acromion at the shoulder's point, with spillover along the inner border of the blade; it can also send pain up the side of the neck to the mastoid behind the ear — that zone sits under the hair on our figure and is described here instead. TrP4 produces a distinctive burning line along the inner border of the shoulder blade. On the figure: the cap on the shoulder point, the band above the blade's spine, and the thin line down the inner border.
Common causes: Desk work with unsupported forearms; rounded-shoulder posture held for hours; reaching forward and up repeatedly; long driving; bra straps and heavy bags loading the top of the shoulder.
Patients say: “The top of my shoulder blade aches, and massage helps for a day at most.” Others describe a burning line along the inner edge of the blade they can trace with a finger.
When to get evaluated: Upper back pain with chest pressure, shortness of breath, or pain spreading to the jaw or left arm needs urgent medical evaluation — referred cardiac pain can present between the shoulder blades.
How this muscle is examined and treated
Examination looks below the pain: the points that reproduce suprascapular ache and the inner-border burn sit in the lower fibers, a hand's width beneath where patients point. Treating only the upper trapezius is why this pattern recurs. Needling the lower-fiber points addresses the source. Assessment and treatment happen in the same visit.
Related conditions
Shoulder DysfunctionNeck & Cervical PainChronic Pain Patterns
This page is educational. It describes muscle referral patterns commonly associated with pain; it does not diagnose your condition. Individual patterns vary. For evaluation of your specific pain, see a licensed clinician. Seek immediate medical care for emergencies. Eugene Baek, L.Ac. · New Jersey License 25MZ00080600