Pain in the back of the shoulder
Here is the list of muscles potentially responsible for these pains, a link can be selected for more details on a particular muscle:
- Deltoid muscle
- Levator scapula muscle

- Scalene muscles
- Supraspinatus muscle

- Teres major muscle
- Teres minor muscle
- Subscapular muscle
- Posterior and superior serratus muscle
- Latissimus dorsi muscle

- Trapezius muscle
- Triceps brachii muscle
- Iliocostal thoracic muscle