Dry heaving is caused by the following reasons: First, chronic pharyngitis or acute pharyngitis, mainly due to too much talking, too often, and long-term talking leads to laryngeal and vocal folds congestion, edema, the occurrence of hypersensitivity reaction, which leads to dry heaving phenomenon; Second, reflux esophagitis, due to the pancreatic sphincter ring relaxation leads to gastric reflux into the esophagus, stimulating the larynx, which produces the symptom of dry heaving; Third, benign gastric diseases, such as gastritis, gastric erosion, gastric ulcers and so on, which can lead to the gastric mucous membrane congestion, edema, gastric peristalsis slows down, weaken the digestive, and so that the gastric reflux of gastric content into the esophagus, resulting in the symptom of dry heaving.