What is the difference between being sore and being in pain? Soreness is often a good thing; you are building muscle or stretching out ligaments, etc...
Those are two perfect examples actually. Let's say I do neck traction for too long or too many pounds; I will be sore. The body just isn't used to it and ligaments and/or tendons are being stretched. It'll feel like an ache.
That's or main tell-tale sign - what were you doing that precipitated this painlike sensation. If you over-did a workout, or did it for the first time, you are using new muscle groups or at least using one that haven't been worked like that in a while - that's soreness, and is normal. Now if this persists for days and started following a awkward movement it can be pain.
My suggestion is to take a break or take it easy on that body part for the next week or until it feels better.
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