I wonder if your body is just readjusting to the redistribution of weight. I would be inclined to add some core body work, I was having low back pain after losing 20lbs and started doing fitball work to strengthen my abs and back. It's really worked for me, and I can do stuff like the rowing machine now which really used hurt my back.
If it continues I would consider getting checked out by a physical therapist who can assess whether it's a muscular/tissue problem that can be solved by exercise and continued weight loss, or whether intervention is necessary.
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