What happens within the respiratory system when someone has hiccups? What can cause hiccups?

Answer:

When the diaphragm becomes irritated, it jerks down, which causes air to rush quickly into the throat. When this air hits the voice box (vocal cords), it causes the sound of a hiccup. Hiccups can be caused by various factors, such as eating too quickly or too much, having an irritated stomach or throat, or experiencing feelings of nervousness or excitement.