It is characterized by stridor and/or retractions. High-pitched sound during breathing (stridor). Respiratory difficulties may include&colon; shortness of breath, stridor, or low oxygen levels among others. More worrisome signs include&colon; shortness of breath, hoarseness, and stridor or wheezing. Obstruction invariably causes a harsh breathing sound known as stridor. As the condition worsens stridor and bluish skin may occur. The most frequent sign is the rapid development of stridor. Respiratory symptoms and signs that may be present include shortness of breath, wheezes, or stridor. Inspiratory stridor often occurs in children with croup. Symptoms include dyspnea, retrosternal pain, hoarseness, stridor, lachrymation, cough, expectoration, and in some cases haemoptysis. A special type of wheeze is stridor. As the airway reopens, breathing may cause a high-pitched sound called stridor. Stridor, trismus, and cyanosis may also be seen when an impending airway crisis is nearing. As croup worsens, stridor may decrease considerably. Stridor should always command attention to establish its cause.