A tight pectoralis major muscle that contains trigger or tender points can trigger chest and shoulder pain.
Additionally, if this muscle is too tight it fosters a round shouldered posture.
Trigger points in this muscle – shown as “Xs” in the picture under “Attachment points” – can refer pain to the red areas displayed below.
The deeper the red, the more prone it is to experience pain in the respective area when trigger points in the pectoralis major are present.
The points X1 and X2 mainly trigger shoulder pain, whereas the other points refer pain to the chest itself, and to the upper and inner side of the forearm.
This muscle can contribute to…
A tight pectoralis major can contribute to an impaired flexibility in your shoulder – e.g. when reaching behind – as it pulls the whole system forwards and keeps it there.