Hiccups are caused by gas going up from the stomach and are a common physiological phenomenon caused by spasmodic contraction of the diaphragm. Vinegar plays a role in relieving the spasm. Hiccups are related to diet, especially eating too fast, eating too much, or ingesting food that is too cold or too hot. Changes in the temperature of the external environment and smoking and drinking can also cause hiccups. A sip of vinegar when hiccups occur can make the symptoms disappear, not because of a specific ingredient in vinegar, but because vinegar has a stimulating effect, and the relevant muscles suddenly become calm under this stimulation, and the diaphragm stops hiccuping by releasing the spasm. Not only is the stimulating effect of vinegar effective, but sudden shock to distract the patient also has an effect. If you have hiccups, try holding your breath or drinking cool water, and pay attention to avoiding spicy and irritating foods in your diet and avoiding getting cold in your abdomen.