Click to expand Tap to zoom Stomach With Acid Reflux by GIANTmicrobes Save $-14.50 $14.50 | / 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Acid reflux is commonly associated with heartburn, which is exactly what it sounds like: a burning pain in the chest area. This is one of the main symptoms when stomach acid flows back up into the esophagus.