Gastric discomfort and reflux of clear water may be caused by gastroesophageal reflux disease (GERD), chronic gastritis, peptic ulcer and other reasons. 1. Gastroesophageal Reflux Disease (GERD): Gastric acid reflux burns the esophagus, leading to increased secretion of salivary glands, part of which may reflux to the parts above the esophagus such as the pharynx and the oral cavity, resulting in gastric discomfort and reflux of clear water. 2. Chronic gastritis: Helicobacter pylori infection, spicy diet stimulation and other reasons can lead to excessive secretion of gastric acid, causing acid reflux, chronic gastritis, manifested as gastric discomfort and reflux of water. 3. Peptic ulcer: patients with gastric ulcers and duodenal ulcers may also experience gastric discomfort and reflux of water. The above symptoms should be timely to the hospital, under the guidance of a professional physician to determine the cause of the disease, daily attention to dietary patterns, regular work and rest, quit smoking and drinking, to avoid stimulation of the gastric mucosa.