Is bronchitis contagious? Understanding the different types of bronchitis can also be helpful in understanding when the illness is and isn't contagious.

A new COVID variant called XFG, or "Stratus" is spreading. Here's what you need to know about the incubation period, symptoms (including particular throat symptoms) and when to take a test.

Give your loved ones the gift of spending time together this holiday season, not a highly contagious virus sometimes referred to as the stomach flu. An uptick in norovirus cases and outbreaks can ...

Some children will go on to develop complications. In rare cases chicken pox can cause a swelling of the brain, called encephalitis; an inflammation of the lungs, called pneumonitis; and stroke, which ...