Barrett’s esophagus (Intestinal metaplasia of the lower esophagus) The metaplasia of esophageal squamous epithelium to columnar epithelium (Barrett’s esophagus) is a complication of severe reflux esophagitis, and it is a risk factor for esophageal adenocarcinoma. Metaplastic columnar epithelium develops during healing of erosive esophagitis with continued acid reflux because columnar epithelium is more resistant to acid-pepsin damage than is squamous epithelium.
Magnesium. Additional note, if you take prescription medications for GERD (Gastro Esophageal Reflux Disease) you may be low in magnesium. If you noticed having more body pain or headaches since taking GERD medications a low magnesium level may be why. Ask your MD to check your levels, ask if it would be wise to supplement.