The main reasons for hiccups are: 1. dietary factors: eating protein-based foods, drinking carbonated beverages, etc., as such substances produce a large amount of gas during consumption, resulting in too much gas in the gastrointestinal tract and thus hiccups. 2. indigestion: due to the weakened digestive function of the stomach, the ingested food cannot be digested into the intestines for a long time in the stomach, and the food residues ferment in the stomach to produce 3, gastrointestinal tract dysfunction: due to peristaltic disorders of the intestines, this can lead to the retrograde flow of gas produced by the intestines during digestion and out of the mouth, resulting in the phenomenon of gas hiccups. 4, tumors of the gastrointestinal tract: mainly seen in tumors of the upper gastrointestinal tract, due to tumor erosion, resulting in damage to the gastric mucosa, in addition to the appearance of gas produced by indigestion. In addition, tumors destroy necrotic material in the gastrointestinal tract, which can also produce gas during digestion, resulting in the phenomenon of gas hiccups.