Croup is a common childhood illness, but it produces a barking cough and a high-pitched inhalation noise that can unnerve parents. Usually, croup will resolve itself with time, but more severe cases might need treatment by a medical care provider, said Jennifer Nead, MD, a pediatric hospitalist at Upstate Golisano Children‘s Hospital. Nead, an assistant professor of pediatrics at Upstate Medical University, also describes the current evidence about humid air treatments for croup.