The causes of heartburn at night need to be considered as dietary and disease causes. Dietary causes include eating before going to bed, eating stimulating foods, etc. Disease causes include reflux esophagitis, duodenal ulcer, stomach mass, etc. 1. Dietary causes: If you eat before going to bed or lie down after eating, the food will not be digested thoroughly, and the stomach acid will easily reflux, resulting in heartburn; if you eat stimulating diets such as chili peppers, mustard, etc., it will also lead to excessive secretion of gastric acid, resulting in heartburn. 2. Disease causes: such as reflux esophagitis can also have acid reflux, retrosternal pain and other symptoms; such as duodenal ulcer can also have hunger stomach pain, stomach pain at night and other symptoms; such as gastric swelling can also have wasting, loss of appetite and other symptoms. For the case of heartburn at night, it is recommended to consult a doctor to analyze the specific causes.