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This is a simplified side view of the chest and upper abdomen.

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Below the lungs sits the diaphragm, the main muscle used for breathing.

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In a hiccup, the diaphragm suddenly contracts without you choosing to. Air is pulled in quickly. (Shown in slow motion.)

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Then the vocal cords briefly snap shut, cutting off the incoming air.

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That sudden contraction and vocal cord closure create the familiar hic sound.

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DrHiccups. Understand Hiccups. Find Relief. Know When to Get Help.