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Influenza (“the flu” for short) is a contagious upper respiratory (nose and throat) infection caused by the influenza virus. There are different types of flu viruses, and they can change from year to year. Flu viruses can be Type A, B, or C. Types A and B cause more severe illness, while Type C generally causes more mild flu illnesses.
Most people who get the flu get better on their own without medical treatment. However, some groups have a higher risk of medical complications. Complications could mean a stay in the hospital. Severe complications may cause death. For this reason, doctors recommend getting a flu shot every year.
Certain groups have a higher chance of having flu complications. Those groups include people who are:
Influenza symptoms include:
See a doctor if you get any of the following:
Call 911 or go to the hospital emergency department if you have these symptoms:
Your healthcare provider may diagnose you with influenza based on your symptoms and may give you one of these tests:
Because some people may need to be treated in the hospital with antiviral medicines, you might need a lab test to diagnose the type of flu you have.
Antiviral medicines may be available as a treatment option. (Antibiotics do not work on viral infections like the flu. See your doctor right away if you are at high risk of serious flu complications. Antiviral medicines can lessen symptoms and shorten the illness by 1 to 2 days. They can also prevent serious complications, like pneumonia.
Most people with influenza get well without medical treatment by:
There are several ways the flu can be prevented from spreading: