28/m. my dorsal spine mri says "dorsal kyphosis is lost". my chest hurts since 2 yrs and i now feel this lost curvature is the reason. lung/heart ok??

Hard to say: There is a normal amount of kyphosis seen in the thoracic spine. But an MRI is not a good test for kyphosis, because the MRI is done with a patient laying on the back and it is normal for a person to lose much of their kyphosis in that position. Full length standing X-rays with flexion and extension views are the typical way spine alignment is assessed.