Low acid causes symptoms because food is not digested and broken down properly. It then ferments in the intestine and gas comes up to push any stomach fluids back into the esophagus.
I can see hypothyroid causing lower acid. Thyroid hormone runs our whole body and when it is in short supply some areas probably slow down. In fact older people develop low acid (called achlorhydria) 30% of them, after age 50 or so. But it can spontaneously happen earlier.
There are many papers suggesting using Betaine HCl for GERD.
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Weezie looking at petunias 8.25.2017
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