Level 1: What is heartburn in pregnant women? Pregnant heartburn refers to a kind of stomach discomfort experienced by pregnant women during pregnancy, which usually manifests as chest burning, soreness, acid reflux and other symptoms. This is caused by changes in hormone levels in pregnant women that cause the esophageal sphincter to relax, causing gastric acid to easily flow back into the esophagus. Level 2: How to relieve heartburn in pregnant women? 1. Diet adjustment: avoid