I often experience shoulder pain.

Lately, I've been experiencing frequent shoulder pain. Could there be an issue with my cervical spine? I try to do regular stretching and pay attention to my posture, but I still often experience pain in my back, shoulder blades, and shoulders. My lower back isn't in great condition either. I heard that if one part of the spine is damaged, it can deteriorate sequentially like a domino effect. Could this also be affecting my cervical spine?