Acid reflux at night may be a physiological phenomenon caused by overwork, or it may be caused by chronic gastritis, esophageal hiatal hernia, reflux esophagitis and other diseases. 1. Overworked: If the recent life stress is too much, overworked, easy to cause cortical dysfunction, to a certain extent, will promote the secretion of gastric acid increased, followed by the symptoms of acid reflux at night, is a physiological phenomenon, do not have to worry about too much. 2. Chronic gastritis: the occurrence of this disease may be related to Helicobacter pylori infection, autoimmunity decline, long-term alcohol consumption, non-steroidal anti-inflammatory drugs and other reasons. It can be induced by irregular eating, overeating and other factors, leading to belching, acid reflux, nausea and other symptoms, so some patients may experience acid reflux at night. 3. Esophageal hiatal hernia: The causes of this disease include elevated intra-abdominal pressure, enlarged esophageal hiatus, etc. A small number of patients may be caused by a congenital larger hiatus in the esophagus. Some patients with a small hiatus are asymptomatic, but patients with a large hiatus will have persistent acid reflux and heartburn, which can manifest as acid reflux at night. 4. Reflux esophagitis: Studies have shown that the basic etiology of the disease includes decreased anti-reflux function, decreased esophageal clearance, abnormal esophageal sensation, delayed gastric emptying, etc. Secondly, it may also be related to obesity, pregnancy, ascites and other factors. Common symptoms include heartburn, reflux, and abdominal pain. There are many causes of acid reflux at night, and it is necessary to visit the hospital to clarify the specific cause.