Stridor is a high-pitched, wheezing sound that occurs when breathing, often indicating a blockage in the airway. It is typically heard during inhalation and can be a sign of various medical conditions, such as croup, laryngitis, or an allergic reaction. Stridor can be a serious symptom, especially in children, and may require immediate medical attention. The sound of stridor is caused by turbulent airflow through narrowed or obstructed air passages. It can be associated with other symptoms like difficulty breathing, coughing, or a change in voice. Identifying the underlying cause is essential for effective treatment and management of the condition.