"Gastric surgery & low stomach acid Are you experiencing heartburn after gastric sleeve or gastric bypass? I want to challenge your normal thought patterns. You see, for decades heartburn has always been considered a symptom of TOO MUCH stomach acid, but here's the thing. Heartburn can occur with low stomach acid as well. So the question is...do you really have too much stomach acid? Symptoms of low stomach acid are... -heartburn -reflux -abdominal pain -bloating -gas -diarrhea -constipation -un