This happens a lot when getting tattooed. Sometimes it feels like the pain from one spot travels somewhere else. I’ve heard people say they feel a spot on their arm in their hip, or a spot on their leg in their shoulder.
Today I was getting the side of my calf tattooed, near the back of the knee, and I actually felt the pain mirrored on the other side of that same leg, almost as if it was going right through. It was such a strange feeling that it made me laugh in pain. Like wtf brain?!
What causes the brain to mix up nervous system signals like this?