causes of excess gas and heartburn
iStock.com/egal. This is the second article in a series on heartburn and GERD. If you havenât read the first one, Iâd suggest doing that first. The idea that heartburn is caused by too much stomach acid is still popular in the media and the public. But as Daniel pointed out in the comments section of the last post, anyone familiar with the scientific literature could tell you that heartburn and GERD are not considered to be diseases of excess stomach acid.