Is it possible to go from gluten tolerance to intolerance or are you born with it?

Gluten intolerance: Gluten-sensitive enteropathy (celiac disease) is much less common than gluten intolerance. Like lactose intolerance, caffeine intolerance, sorbitol intolerance (with regard to needing to restrict each respective substance), people who are gluten intolerant do better to avoid gluten-containing foods. Only about 10% of the population are gluten intolerant. Add gluten back to diet slowly & assess.

Tendency yes: There are subgroups of the population that have the genetic tendency toward gluten sensitivity or celiac. But there seems to be other factors that influence actual development of either.