How hiccups occur and duration categories
Hiccups start when the diaphragm contracts involuntarily and air is drawn in quickly, causing the vocal cords to close and produce the familiar “hic” noise. Clinically, hiccups are often categorized as brief (seconds to minutes) or prolonged. Hiccups that continue beyond 48 hours are considered persistent and may need further evaluation; very long-lasting or recurrent cases require specialist review.
