Hello. I am a 33 year old male living in Denmark since 10 years. I am originally from India. Recently on my trip to India, I was sleeping on hard mattresses, as is the case usually with beds in India. And for some reason it has probably not gone very well with my back. In Denmark we sleep on very soft mattresses. And my back has usually been pretty good and have had no complaints around it. Even though I have knee problem due to my history in sports. But this time around, the pain has been very consistent. The problem is that when I sit on my bed, in a fairly nice posture, with back straight, and leaning back on a pillow or something, my middle back starts feeling sore and irritates me, and then I have to sit with out any support for a while to relieve the tension. Even when bending sometimes, I can feel the tightness in lower and middle back, can feel its sore. It's been a month and now I am back in Denmark since a week, but still don't see any changes. In general what do you think is the problem and could it be linked to the mattresses? On a side note, an MRI of my lower spine was normal, with a slight slight disc bulge, without any significant nerve compression, according to the radiologist. So I am assuming the structure and things are good, but maybe it's just a passing thing. But still need to do something so it does not get worse, and hopefully to get it back to normal sooner. Kindly suggest. Thank you