The medical term for hiccup is singultus
The word singultus is Latin for “to catch one’s breath while crying.” The blog Medical Student’s Diaries defines the motion of a hiccup as the involuntary contraction of the diaphragm, occurring at the same time as the contracting of the voice box, and the closure of the glottis, which together blocks air intake. The glottis is located in the middle part of the larynx, where the vocal cords are, and when it snaps shut, it causes that telltale hiccup noise. These quick tricks can help stop hiccups.
Hiccups have many different causes
Hiccups can be caused by shock, stress, alcohol consumption, smoking, a sudden change in temperature, excitement, and overeating. Many of these things irritate the esophagus, which can trigger the hiccups.