Hiccups is the spasmodic contraction of the diaphragm followed by a spasmodic closure of the glottis, $i.e.,$ a sharp inspiratory sound. Stimulus is usually irritation of sensory nerve endings of digestive tract.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.