A hiccup, also known as hiccough, synchronous diaphragmatic flutter (SDF), or singultus is a common condition that probably affects every human, in which there is an involuntary esophageal contraction of the diaphragm that recurs several times per minute. The diaphragm is the muscle that separates the chest from the abdomen - it is underneath the ribcage - and has a key function in breathing...
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