Answer by
lillianne (14)
Fluctuating hormonal levels during pregnancy can cause relaxation of the valve of esophagus, which normally keeps stomach acids from flowing into the esophagus. If the esophageal valve relaxes (typically when not eating), this relaxation can cause stomach acid to rise into the esophagus. This stomach acid in the esophagus causes a burning sensation, known as gastrointestinal reflux, or GERD.