Stomach always has acid reflux, which may be caused by bad dietary habits, stomach diseases, reflux esophagitis and so on. 1. Bad dietary habits: If you eat a lot of spicy, irritating and overly acidic food, it may cause excessive secretion of stomach acid and acid reflux. 2. Gastric diseases: when suffering from gastritis, gastric ulcer and other gastric diseases, it may cause inflammatory stimulation of the gastric mucosa, inflammatory lesions, resulting in excessive secretion of gastric acid, thus causing acid reflux symptoms. Some patients may be accompanied by epigastric pain, nausea, loss of appetite and other symptoms. 3. Reflux esophagitis: Due to the reflux of gastric and/or duodenal contents into the esophagus, causing inflammation, erosion, ulceration and fibrosis of the esophageal mucosa and other lesions, patients usually have typical symptoms of heartburn and acid reflux. There are many reasons for acid reflux, so it is recommended to go to the hospital in time to have a relevant examination and follow the doctor’s instructions after clarifying the cause of the disease.