I have a 4 yrs old daughter who's been having upper and lower back pain and constipation since early 2011. she saw diff dr's and specialist already b?

Pediatric evaluation: Take her to pediatric gastroenterologist. University medical centers or children hospital are good places to go with multiple health questions in pediatric population.

Peds neck pain: Persistent pain in kids is not very common. Especially if persisting for a year or more. Normal x-rays don't really rule much in or out, since developmentally the peds spine is filled with growing bone and cartilage. Inflammatory conditions like juvenile rheumatoid arthritis, lyme's, etc should be considered. Nice about jra is generally self limited but needs diagnosis to prevent eye problems.