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Hi Kjockie,   We've asked the experts online here to post something about the z-line because it has come up a couple times. Best I can figure from the postings below, is that the z line is the area between the esophagus and the stomach at the sphincter, the muscle that closes the stomach to the esophagus. When there is a problem with this, it can cause acid to rise in the esophagus. That is my laymen's explanation for what I have read below.   Summerrain is a member here who is having issues with the z-line being a problem. You can read her posting here. User Hawkenser also had issues with the z-line. You can read his posting here.