Pronounced: Bronk-ee-oh-LIE-tusEn Español (Spanish Version)
Bronchiolitis is a childhood disease that affects the lungs. It occurs when a virus enters the breathing system. The virus causes the tiny airways in the lungs to become swollen. As a result, a thick fluid called mucus collects in the airways. This makes it hard for air to flow freely in the lungs.
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Bronchiolitis is caused by a virus. There are several different types of virus that may cause it. The viruses are easily spread from person to person like a common cold. It spreads most often through coughs or sneezes which release droplets of moisture into the air. Breathing in the air can cause the infection in a noninfected person.
Last reviewedAugust 2014by Kari Kassir, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.