The vocal cords are two bands of
tissue inside the larynx (voice box). The larynx rests at the top of
your trachea (windpipe). This is in your throat. Normally, when a person breathes in and
out, air flows through the vocal cords and in and out of the lungs, allowing him or her
to breathe easily. But with VCD, the vocal cords close when they should open. When you
breathe in, instead of opening, the vocal cords close and cut off the air supply. The
cause of VCD is often unclear. Conditions such as postnasal drip or acid reflux might
trigger it. Cigarette smoking and cold air are other possible triggers.