So when your body is busy fighting an infection, adding extra stress through exercise can potentially worsen symptoms and ...

Bird flu H5N1 has infected dozens of people in the U.S. this year. Could it be the next pandemic? Experts explain the threat ...

A number of conditions can block or narrow the upper airway and cause stridor. The most common is a viral infection called croup. Other causes include swallowing a small object that gets lodged in the ...