So my right quadratus lumborum has always been pretty tight, especially after deadlifting, squats, etc. I went on a cruise last week and for some reason, my right QL tightened up progressively over the trip. I wasn't being that active, either. It just tightened up over the course of five days, and now this tightness is beyond a minor annoyance, to the point where I'm not going to the gym and have to sit/sleep in certain ways. It doesn't seem like it's gotten better in the past four days, which is odd... I figured it will loosen up by itself.
I'm assuming it's the right QL because it's only on the right side, very deep, and I can feel trigger points all over the area (by pelvis and under rib). I also feel it go nuts when I sneeze. I've read all the previous threads on the QL, btw, I'm just seeing if anyone has any advice. At this point I think only ART can get rid of it.
edit: I get the pain basically whenever the QL moves... extending/flexing the lower back, as well as lateral flexion (left or right). Pain is only on to the right of the lumbar spine.