The Back Board is for people with lurabar (lower back) problems, while the Spinal Cord Board is for people with cervical and thoracic (neck and mid-back) problems. I would encourage you to seek advice on the Spinal Cord Board to get better answers.
There are a lot of possible causes and it would be best for you to see a doctor to have them sort out what could be going on. To get better answers on the boarRAB, it is best to be specific about your symptoms - where specifically do you hurt, what kind of pain it is (trobbing, burning, stabbing, aching), are there activities that make it worse, does it hurt more at certain times of day, etc.
Good luck!