Many of us have had the flu before and recovered completely. But some people can get very sick due to complications.

The flu vaccine is one vital part of reducing your risk of flu. But what if you're allergic to eggs, which are used to make flu vaccines? There's a new option for you.

Little kids are notorious for having runny noses a lot of the time. It can be hard to tell the difference between allergies, a cold and a more serious infection. Research data can help.

The World Health Organization has initiated an emergency meeting this weekend to combat a mysterious new respiratory illness that may be more deadly than SARS.

Early diagnosis of sarcoidosis is key to preventing severe organ damage. This disease, which causes inflammation of body organs, can lead to permanent scarring of tissue if untreated.

When flu season is around the corner, you're likely to see lots of reminders to get the flu vaccine. Is the flu vaccine likely to make much of a difference?

Some babies may be more likely than others to develop respiratory infections. This is especially true of babies prone to allergies. Secondhand smoke can make the situation worse.

Young children can become ill with a variety of respiratory infections. One common illness is bronchiolitis. The good news is that serious bronchiolitis rates may be going down.

Not all children are required to get their immunizations. Some do not get them for health reasons or for religious reasons. But these children may be more likely to get sick.

Most cases of the flu don’t lead to more than a few days home from work, or sometimes a hospital stay. In some cases, however, the flu can cause major respiratory problems and even death.