Bitter esophageal reflux is related to improper diet, reflux esophagitis, functional dyspepsia and other reasons, as follows. 1. Improper diet: If you eat too much or eat too much greasy, spicy and stimulating food, it will lead to excessive secretion of gastric acid and cause bitter esophageal reflux. 2. Reflux esophagitis: a disease in which the contents of the stomach and duodenum reflux into the esophagus due to dysfunction of the esophageal sphincter caused by a variety of reasons, with the main symptoms being acid reflux, heartburn, and the symptom of esophageal reflux bitterness. 3. Functional dyspepsia: The dysfunction of the gastrointestinal system may lead to the reflux of duodenal contents, resulting in bitter esophageal reflux. In addition, many people do gastroscopy can also be seen accompanied by bile reflux, which can also cause esophageal reflux bitterness. It is recommended to consult a doctor for diagnosis in time to take targeted treatment, so as to avoid delaying the condition.