Best Answer: Hiccups are sudden, involuntary contractions of the diaphragm muscle. As the muscle contracts repeatedly, the opening between your vocal cords snaps shut to check the inflow of air and makes the hiccup sound. Irritation of the nerves that extend from the neck to the chest can cause hiccups.
Department Of Mines, M. & Virginia. Department Of Transportation. (1993) Campbell County, city of Lynchburg, Virginia: 1:50 000-scale topographic map. Reston, Va.: The Survey. [Map] Retrieved from the Library of Congress, https://www.loc.gov/item/94684540/.
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