side rib cage funny zing?

Laura
So, I lm guessing this is linked to my boobs somehow but I am getting these weird zings in the tissue on my side mid rib cage. Again - it's gotta be something hormonal with boob soreness but it's so weird! At first I thought I had a tag in my bra then I thought it feel like the little plastic thing from store tags. One day it felt like a paper cut then was gone. Anyone know what the pathology might be?