Heartburn may be caused by mental factors, chronic gastritis, peptic ulcer, reflux esophagitis and other reasons. 1. Mental factors: mental tension, anxiety, depression, resulting in vegetative nerve disorders caused by eating bread heartburn. 2. Chronic gastritis: chronic inflammation of the gastric mucosa, eating bread increases the secretion of gastric acid, so you feel heartburn, bloating, nausea, vomiting and other symptoms. 3. Peptic ulcer: the gastric mucosa has an ulcerated surface, the gastric acid secretion is more, eating bread stimulates the gastric acid secretion to increase causing heartburn, stomach pain, acid reflux and other symptoms. 4. Reflux esophagitis: The stomach contents will reflux into the esophagus when the sphincter of esophageal cardia is out of adjustment, which will stimulate the esophagus and cause heartburn and discomfort in the sternum. It is recommended to consult a doctor in time to identify the cause of the disease and follow the doctor’s instructions for treatment.