Change in lining. Barrett's esophagus is when there is irritation to the area between the esophagus and stomach, causing the cells there to change from one form to another. The reason this is important is because the changed cells have a relatively high (compared to normal people) chance to progress to cancer. You would need endoscopy to find and treat this condition.
Barrett's. This is a change in the lining of the esophagus in response to longstanding reflux. It is a precancerous change which requires frequent surveillance EGDs to make sure cancer is not developing. If Barrett's is found, the abnormal areas can be ablated so that they do not progress to cancer.