I have a minor pain in my left arm that is transiet. It feels like a pinched nerve. Should I be concerned?

Pulled muscle? There are a lot of things, many of them minor, that can lead to such a complaint. If it's really bothering you, it needs to be evaluated by your doc to rule out anything bad. Osteopathic manipulation can be very helpful for minor pain complaints such as this that aren't caused by more ominous problems.