Hi, I Just Wanted To Ask What Might Be The

Hi, i just wanted to ask what might be the reason behind my full back pain? Waking up daily in the morning seems so difficult for me. For almost 2 months I am suffering back pain every time i rose up from bed. I tried sleeping with out pillow, bought medical mattress, but nothing has been changed. But once I'm done my daily shower, then I feel better. The next morning comes, back pain still there.
Thank you in advance.