Vaccines save lives by preventing a person from getting a disease or dramatically lowering their risks for the disease. But vaccines are not perfect. Their protection can wear off.

One of the best ways to reduce risk of catching the flu is getting a flu shot. However, all vaccines carry some small risks. Researchers continue to look for possible evidence of these risks.

For years, vitamin C has been said to help people stay healthy and recover faster from a cold. Science says this may be true in some ways.

During flu season, the flu often seems to spread like wildfire. Recent research gives some insight about how the flu spreads so quickly.

While the flu vaccine lowers chances of getting the flu, there have been concerns about giving it to egg-allergic children. This group now appears to have no reaction from the treatment.

Smoking is unhealthy for the healthiest of people. But for people with human immunodeficiency virus (HIV), smoking is even worse. Want to stay healthy with HIV? Quit smoking now.

One drawback of the seasonal flu vaccine is that it's made with egg proteins – a possible problem for people with egg allergies. But next year, they will have a new egg-free option.

Pediatricians ask many questions at yearly check ups. There’s one question they might need to add to the list: Where were the child’s parents born?

With a flu pandemic going on, public health authorities are encouraging everyone to get flu shots. But pregnant women may worry – will the shot hurt my baby?

Being hospitalized for pneumonia can put patients on a fast track to heart disease. If that weren't bad enough, these patients may also be at risk of developing irregular heart beats.