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A hiccup is caused by a spasm of the diaphragm. The sudden rush of air into the lungs causes the glottis to close, creating the "hic" noise. Some home remedies include drinking a glass-worth of a carbonated beverage with salt in it (to quickly balance out the potassium-sodium levels in the nervous system), tablespoon of sugar, tablespoon of honey, drinking water upside-down, holding your breath (while optionally squeezing your stomach), breathing into a paper bag, eating, and concentrating on your hiccup so hard that it doesn't happen again. The causes of hiccups are unknown, but they can sometimes be brought on by taking a cold drink while eating a hot meal, eating very hot or spicy food, or laughing vigorously.
Hiccup in Latin is singultus.
Hiccup is sometimes written as hiccough, though this spelling is becoming archaic.