A stridor is a rough or hoarse voice with a high or low pitch, which appears every breath or exhalation. This additional breath sounds due to narrowing or obstruction of some of the upper respiratory tract. Stridor is also known as snoring or snoring sound. Infants and children are more prone to stridor, because the respiratory tract is narrower and softer than adults. However, besides that, there are still many things that can cause stridor, either suddenly (acute) or in the long term (chronic). Various Possible Causes of Stridor The upper respiratory tract includes the pharynx, larynx (voice box), epiglottis (valve at the base of the tongue), and windpipe. Disturbances in the wrong channel can cause stridor. Some conditions that allow the emergence of stridor include: Choking An allergic reaction that causes swelling in the throat or upper airway (anaphylactic). Respiratory tract irritation that results from inhalation of burnt smoke or chemicals. Inflammation of the bronc...