So I have been diagnosed with a locked up/tight SI joint apparently, and I was doing squats today and I got pain in my mid/upper back it hurts when I look up and down, could this be a possible herniated disc? I've gotten most of my lower back pain above one of my glutes to go away, and now this. Could it have been a misdiagnosed injury as an SI joint problem when really it is a herniated or bulging disc?