The burning sensation in the esophagus due to pregnancy vomiting in early pregnancy is due to the increase in abdominal pressure caused by vomiting, and the reflux of digestive juices from the stomach or duodenum into the esophagus, leading to inflammation and ulceration of the esophageal mucosa. Gastric fluid is acidic and duodenal fluid is alkaline. Whether acidic or alkaline, entry into the esophagus can lead to damage to the esophageal mucosa. Pregnant women who experience burning sensation can try to choose a light, easy-to-digest diet, eat small meals and minimize vomiting, and if it is severe, go to the hospital for prompt medical attention.