So I've been having issues when I breath. It isn't all the time and it only last for 2 days at the most. When I take a deep breath I get this unusual pain in my mod to lower back and it gets worse the deeper I take a breath or a big yawn. It doest hurt when I stretch or reach for something or even when I'm sleeping. Sometimes I can go months with out experiencing this pain and other times its every other day or so. And it's on both sides of my spine but more so the left. Does any one know what this is?