What could be the reason for this pain I get on my shoulder?

Question

It's more like my collarbone area (right on top of the left collarbone) and it comes out randomly, sometimes once a week, sometimes three times a week, sometimes once in two weeks. It's hard to describe the pain. Maybe from my collarbone to the top of my bicep, it's a staggering, excruciating, pain that last between 3 to 10 seconds. It's so painful that I have to stop what I am doing and I can't move my left arm during that time.

I'm 18, about 140, rather active when it comes to exercise, although I don't eat very well because my metabolism is awesome right now, and the pain has been coming by for few months now.

Answer 1

If it is intermittent and doesn't occur with movement, this is most likely a pinched nerve. A chiropractor who specializes in sports injuries can certainly correct that because pinched nerves in that area are usually due to a misaligned bone in the lower part of the neck.