Flu ( Influenza )
What is the flu?
The flu is an infection that is caused by viruses. The medical term for the flu is "influenza."
There are different type of flu, the most common type of flu is the "seasonal" flu. Besides seasonal flu, there is also the "swine" flu and the bird flu. Bird flu ("avian flu") is a severe form of the flu that is caused by a type of flu virus that first infected birds.
What are the flu symptoms?
Symptoms of flu can come on very suddenly.
Common symptoms of flu:
Fever (temperature higher than 100ºF or 37.8ºC)
Headache or body aches
Serious symptoms of flu in adults: