A tight pectoralis major muscle that contains trigger or tender points may give you pain in your chest or shoulder.
Additionally, if this muscle is too tight it fosters a round shouldered posture.
Especially in men it is well known and popular as it, if well trained, gives them a strong looking front.
Trigger points in this muscle – shown as “Xs” in the picture under “Attachment points” – can send pain to the red marked areas displayed below.
The deeper the colour, 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 give you a painful shoulder, whereas the other points send pain mainly to the chest itself, and to the upper and inner side of your forearm.
This muscle can contribute to…
A very tight pectoralis major will definitely contribute to an impaired flexibility in your shoulder – e.g. when reaching behind – as it pulls the whole system forwards and keeps it there.