It is characterized by involuntary, spasmodic contractions of the diaphragm, followed by a sudden closure of the glottis (the opening to the windpipe). This creates the characteristic "hic" sound.
It is characterized by involuntary, spasmodic contractions of the diaphragm, followed by a sudden closure of the glottis (the opening to the windpipe). This creates the characteristic "hic" sound.