Chronic mid back pain for 3 years. my doctor said muscle spasms and i went to a chiropractor and spine doctor all with no help. ?

18 y/o w/ 3 yrs MBP : It certainly could be muscle spasms, but after 3 years, need to look at why your back is staying in spasms. Is it a structural problem? Bad ergonomics or posture? Congenital? Acquired? Sport related? Etc. Detailed history, physical exam, x-ray and MRI would answer many of these questions. Core strengthening of your mid-section/thoraco-lumbar-abdominal muscles is likely to help. Good luck.

Correct diagnosis: Adolescents do not have ddd. They may have MRI findings of this, but generally speaking, ddd is extremely unusual in this age group. I would be more suspicious of scheuermann's disease (may be present without spinal deformity, but MRI findings will show multiple "degenerative" discs, spinal stenosis, herniated discs, etc.). I would invest some time and find a doc that will pursue the right dx.