It can just be your body remembering, and you or may not be able to eventually attack "visual" memories to the sensations.

Associations (physical and mental) are funny things. You could have hurt your arm as a child playing outside, and felt vulnerable and that could have connected to your feelings of being abused and injured... so now you connect abuse with your arm hurting.

Or there might be some more direct connection.

Also, you could look into Eastern medicine and what that area of the body may symbolize -- for instance, some back pain is said to be associated with the "past".

I've done reiki on body pain and it's been very effective.

M