There are several reasons for hiccups after drinking: 1. When you drink too much alcohol, the ethanol in the alcohol is converted into acetaldehyde, which causes damage and burns to the gastric mucosa, leading to excessive gastrointestinal reflux and gastric acid, which can lead to clinical symptoms such as acid reflux, heartburn and hiccups, and can be relieved by drugs that promote gastric acid absorption and digestion, or drugs that inhibit gastric acid secretion. 2. The clinical symptoms of hiccups can also occur when the diaphragm is in spasm.3. Drinking too much alcohol can lead to an increase in the peristalsis of the gastrointestinal tract, which can lead to excessive flatulence and clinical symptoms of hiccups.