A hiccup is an involuntary movement of the diaphragm, followed by a quick close of the vocal cords, the U.S. National Library of Medicine says.

Typically coming in spurts, a hiccup may be triggered by:

• Eating too much or too quickly.
• Eating spicy food.
• Drinking alcohol.
• Drinking a carbonated beverage.
• Conditions that irritate nerves that influence the diaphragm.
• Feeling nervous or excited.
• Certain medicines.
• Abdominal surgery.
• A metabolic or central nervous system disorder.

Source: HealthDay

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