Peter Attia· MD
so it's rubbing or moving underneath this any place in our body that there's two structures and a uh anatomically in the limbs that move differentially like with one another there's usually a bursa that forms in between and so that Bursa is here I'll draw it in green that Bursa lives right in there and so it's just the thin filmy structure that can thicken up and become very inflamed and become bursitis and that's very painful so that's a common cause otherwise the