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Skip Navigation LinksPennsylvania Department of Health > My Health > A-Z Health Topics > I-L > Influenza(Flu)


Influenza, also known as the flu, is a contagious disease that is caused by the
influenza virus. It attacks the respiratory tract: nose, throat and lungs.
Influenza is different from a cold.
Influenza usually comes on suddenly and may include these symptoms:
·         Fever
·         Headache
·         Tiredness (can be extreme)
·         Dry cough
·         Sore throat
·         Nasal congestion
·         Body aches
These symptoms are usually referred to as "flu-like symptoms."
Did you know? That anyone even young, healthy adults can get sick from the flu and spread it to others. Buzz buzz (text message: You coming out tonight? I can't I have the flu. My niece and girlfriend have it now too.) The short time it will take you to get a flu vaccine. Can help protect you and the ones you love. The flu vaccine is safe and does not cause the flu. #GetAFluVax