Costochondritis (with unknown cause) is a common cause of chest pain in children and adolescents. It accounts for 10% to 30% of all chest pain in children. Annually, doctors evaluate about 650,000 cases of chest pain in young people ages 10 to 21. The peak age for the condition is ages 12-14.Costochondritis is also considered as a possible diagnosis for adults who have chest pain. Chest pain in adults is considered a potentially serious sign of a...