What is the difference between croup and asthma?

Croup is....: Inflammation of the larynx and trachea in children, associated with infection and causing breathing difficulties. Asthma is a respiratory condition marked by spasms in the bronchi of the lungs, causing difficulty in breathing.

See below: In the past, croup was equivalent to diphtheria, which we don't see any more because of vaccination. Croup generally refers to upper respiratory problems (large airways) causing a bad cough. Asthma refers to lower respiratory problems (small airways) that become constricted and cause shortness of breath, cough and/or wheezing.

Two different condit: Croup is virus infections which causes tracheeal and laryngeal edema and the child makes noises when breathing and most of times is self limiting and gets better without any treatment , sometimes in severe case requires systemic steroids.Asthma is a chronic airway disease with inflammation and narrowing of bronchi, causes cough, breathing difficulty and has to be treated with steroids&bronchodilater.