left side of neck and slight shoulder pain while benching?

k so last few sessions that revolved around the 5x5 strong lift that had the bench press i noticed and felt a increase in tension and pain along the left side of my neck and left shoulder. it isn't a isolated pain it's more like a straight line. not sure what it is and if anyone has had this sorta thing as well could you tell me what i may be doing wrong?. i also been searching youtube and i been following form as best as i can .