A narrowing of the smallest airways in the lung (bronchioles) causes wheezing. This narrowing results from swelling caused by a virus. The respiratory syncytial virus (RSV) causes most bronchiolitis.

Soon-to-be medical school graduates received 877 more primary care position offers in the 2025 Main Residency Match compared with the previous year, according to the National Resident Matching ...

Understanding asthma symptoms and the various types of asthma can help you find the right treatment and manage your condition. Learn more and prevent asthma attacks.