Hi! Well, I guess the acute pain I am experiencing is not a muscle spasm because the area is soft to the touch while the pain is going on. Maybe an internal muscle that can't be felt on the surface? The colo-rectal doctor mentioned psoas muscle abscess but my pcp said he didn't think so becuase 1) a psoas muscle abscess makes you "really sick" and 2) definitely not something you have for 2 years. Forgot to ask him if that would've been picked up during a lap. I think the psoas muscle is in a retroperitoneal location so maybe not. I read somewhere that sometimes during appendicitis if the appendix points towards the back there can be back pain due to psoas muscle irritation.