Less often it can be caused by an allergen, such as pollen.The laryngitis viruses cause Croup in younger children.In children, most hoarseness is caused by a virus.Caused by an infection or irritation of the larynx (voice box) and vocal cords. Laryngitis is the medical name for a hoarse voice.
If hoarseness is severe, the child can do little more than whisper.Hoarse voice is raspy and deeper than usual.