For at least a few months, I had middle back discomfort. I assumed it was from bad posture on office chair. Would feel discomfort lying down tossing and turning, almost hesitant like the lack of smooth movement will cause some damage.
Yesterday I felt around back there and noticed there's a lump and some sore tightness around there. I rubbed it like it's a bruise and last night sleeping my back felt better. I wonder if it was just a long term bruise from bumping my back against a wall corner.
I'm considering buying some sort of 3M peel and stick rubber or foam padding for the corner.