Anyone hear of trigger points?

[forgop]

For several years, I've dealt with pain associated to a spot just below my left shoulder near my spine that gets incredibly tight. It often causes pain to radiate from my neck to my arm at times. I'd never seen a doctor about it and a little google search identified this type of thing as a trigger point. It seems to get much worse during times of high stress.

Finally going to see a chiropractor this afternoon to see if he can help remedy this issue. Just wondered if anyone else has had a similar issue and what they may have done to get relief at times.