what would cause extreme muscle stiffness in the morning and after moderate use in the core area, sternum throughtout back?

Posted by David

No problem in other parts of body.  Sometimes it hurts to touch the breastbone.  Seems to go away with activity but comes back when resting.  Often times it is hard to get out of chair because of back/chest tightness.  I have had CT scans, bones scans, etc   no answer.