Are Hiccups Caused By Muscle Spasms?
Are Hiccups Caused By Muscle Spasms? Hiccups are caused by involuntary contractions of your diaphragm — the muscle that separates your chest from your abdomen and plays an important role in breathing. This involuntary contraction causes your vocal cords to close very briefly, which produces the characteristic sound of a hiccup. Are hiccups diaphragm spasms?