there isnt tenderness on the rib cage, the twinge is low down i would say under last rib can sometimes move to the side.
lump is maybe a little over a cm and i can move it, doesnt seem to be getting bigger, sometimes i need to root around to find.
so you think that with this twinge if there was more going on i would have more symptoms? i have no tenderness to touch or sickness etc i also dont feel i need pain relief or anything its just an annoying feeling?
so if my doctor examined my shoulder would they be able to determine what it is just by examination?
Twinge for a moment is often from muscle spasm/ cramp.
Nerve pinching is also possible.
Other causes usually produce more symptoms.
Doctor can examine it & in most cases will be able to give you a provisional diagnosis.