What are hiccups classified as?
What are Hiccups?Hiccups are involuntary spasms of the diaphragm muscles that draw air into the lungs. Hiccups occur when the diaphragm becomes irritated, causing it to contract suddenly and involuntarily. As the diaphragm contracts, the opening between the vocal cords (glottis) snaps shut, causing the hiccup sound. Hiccups are usually caused when the nerve that extends from the neck to the chest is irritated (the phrenic and vagus nerves).