It's not easy to tell these health conditions apart based on their symptoms alone. Find out about the differences between these illnesses.

Nine states are seeing moderate flu activity, while 26 report high or very high case rates. Flu test positivity continues to ...

Add Yahoo as a preferred source to see more of our stories on Google. New research shows some infections increase the risk of heart attack and serious cardiovascular disease. Philip Dulian/dpa ...

This fall, a federal vaccine advisory panel changed recommendations, saying Americans six months and older should discuss the risks and benefits with their health care providers. The move walked back ...

Six more US children died of influenza last week, for a total of 66 pediatric deaths this respiratory illness season, as flu ...

Flu activity remains elevated across Tennessee, with parts of East Tennessee reporting some of the highest levels of ...

This influenza season is "particularly severe," Professor Peter Chin-Hong said.