Feel a sore throat and runny nose coming on? How do you know if it’s the common cold or something more like RSV or respiratory syncytial virus?

RSV primarily affects children under 2, but it can be serious in adults over 65 who are immunocompromised or have chronic conditions. Here’s why.

For some, RSV symptoms can be more severe than those of the common cold. Here’s how to stop the spread.

Most of us can breathe in MAC, a bacteria found in soil and water, and never get sick. For others, it can lead to infection and lung disease.

Bronchitis is a common condition. Learn more about what it is, what causes it, how it changes your lungs, and how it's treated.

MERS is a respiratory illness that can lead to fever, shortness of breath, pneumonia and kidney failure. Find out more about it and how it spreads

Pneumonia is an infection of the air sacs in your lungs. It’s usually mild but can be deadly, so see a doctor.

Compare the sound of healthy lungs to noises that indicate a bigger health issue like pneumonia, rales, and other conditions.

Breathing in secondhand smoke can lead to several serious health conditions.

Sixth-grader Chloe Fernandez shares her story through her book, PCD Has Nothing On Me! See how WebMD’s 2017 Health Hero: Advocate doesn’t let this condition hold her back.