Low Stomach Acid
There aren’t too many tell-tale signs of low stomach acid, other than perhaps feeling full and tired after meals as well as experiencing acid reflux like symptoms. Nonetheless, low stomach acid is very common in Hashimoto’s. There are several signs and symptoms that would leave me to believe that a person with Hashimoto’s has low stomach acid. I often tell the story about how this supplement changed my life. Excessive fatigue was my most challenging symptom.
The hidden causes of hearburn and GERD by Chris Kresser. Basically it's bacterial overgrowth from low stomach acid, so avoiding things that feed bacteria (sugar and antibiotics) and avoiding acid reducer meds (prescription and OTC like Tums & Rolaids), as well as addition of probiotics, is the only real way to get rid of the problem.