The voice is usually hoarse. When your child breaths in, you hear a harsh, raspy, vibrating sound. Breathing is very difficult.
Stridor is usually only present with crying or coughing.
As the disease becomes worse, stridor also occurs when a child is sleeping or relaxed. It is usually part of a cold. Swelling of the vocal cords causes hoarseness. Stridor occurs as the opening just below the cords becomes more narrow. During this time, it can change from mild to severe many times.