The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and in some cases, it can even lead to death.

How does the flu spread?

The flu spreads through contact with an infected person's respiratory droplets. These droplets can be released when someone coughs, sneezes, or talks. They can also be deposited on surfaces, such as doorknobs or countertops, where they can be picked up by others.

What are the symptoms of the flu?

The most common symptoms of the flu include:

* Fever

* Chills

* Body aches

* Sore throat

* Congestion

* Runny nose

* Sneezing

* Fatigue

* Weakness

* Loss of appetite

How is the flu treated?

There is no specific cure for the flu, but there are treatments that can help relieve symptoms and prevent complications. These treatments include:

* Rest

* Fluids

* Over-the-counter pain relievers

* Antiviral medications

How can I prevent the flu?

There are a number of things you can do to help prevent the flu, including:

* Getting a flu vaccine

* Washing your hands frequently

* Avoiding contact with people who are sick

* Covering your mouth and nose when you cough or sneeze

* Staying home if you are sick

When should I see a doctor?

You should see a doctor if you have any of the following symptoms:

* Difficulty breathing

* Chest pain

* Confusion

* Seizures

* Vomiting

* Diarrhea

* Dehydration

* High fever that does not improve with over-the-counter medications

* Flu symptoms in children that improve and then quickly return and get worse

* Flu-like symptoms that improve but then return with fever and worse cough