Anyone hear of trigger points?

[forgop]

So I talked to the guy today in my clinical abou my trigger point issue. He had a no show and took the opportunity to give me a treatment. I think he did 4-5 needles around my left shoulder, put a warming lamp over it, and about 30 minutes later, I was done. It's amazing how much the muscles that were as hard as a rock before and have loosened up over the last 4 hours since then.