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www.webmd.com/cold-and-flu/flu-guide/flu-symptoms-types

Fever, muscle aches, headaches -- all are flu symptoms. Learn about types of flu viruses (including bird flu), the symptoms, and complications in high-risk groups.

www.cdc.gov/flu/about

Note: New information about the upcoming 2019-2020 flu season is available. Influenza (flu) is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness. Serious outcomes of flu infection can result in hospitalization or death. Some people, such as older ...

www.activebeat.com/your-health/9-common-influenza-symptoms/13

Loss of appetite is another common symptoms of the flu, especially in those adults and children who experience gastrointestinal issues like nausea, vomiting, and diarrhea. With vomiting and diarrhea, in particular, frequent loss of fluids can lead to dehydration, which is a major health concern ...

www.healthline.com/health/cold-flu/early-flu-symptoms

During flu season, having a scratchy throat, body aches, or fatigue can signal the arrival of the flu virus. Detecting early flu symptoms can help prevent spreading the virus and lead to prompt ...

www.mayoclinic.org/diseases-conditions/flu/symptoms-causes/...

Symptoms. Initially, the flu may seem like a common cold with a runny nose, sneezing and sore throat. But colds usually develop slowly, whereas the flu tends to come on suddenly. And although a cold can be a nuisance, you usually feel much worse with the flu. Common signs and symptoms of the flu include: Fever over 100.4 F (38 C) Aching muscles

www.mucinex.com/blogs/cold-flu-symptoms/common-and...

Common and Uncommon Symptoms of The Flu. No one likes to get sick, but a flu can hit especially hard. Flu symptoms typically develop quickly and, in some cases, can turn serious. Here’s what you can typically expect when you catch a flu, and which less-common symptoms might make an unwelcome appearance, too.

en.wikipedia.org/wiki/Influenza

Influenza, commonly known as the flu, is an infectious disease caused by an influenza virus. Symptoms can be mild to severe. The most common symptoms include: high fever, runny nose, sore throat, muscle pains, headache, coughing, sneezing, and feeling tired. These symptoms typically begin two days after exposure to the virus and most last less than a week.

www.prevention.com/.../health-conditions/a22498824/cold-vs-flu

There are a few key differences when it comes to flu vs. cold. Here, doctors compare flu symptoms with cold symptoms, and tell you when you need to go to the doctor for flu treatment.

medlineplus.gov/flu.html

The viruses pass through the air and enter your body through your nose or mouth. Between 5% and 20% of people in the U.S. get the flu each year. The flu can be serious or even deadly for elderly people, newborn babies, and people with certain chronic illnesses. Symptoms of the flu come on suddenly and are worse than those of the common cold.

time.com/5421886/cold-flu-symptoms

Cold and flu symptoms. A cold typically lasts about three to five days, while a flu tends to linger about twice that long, Steinbauer says. Also, a fever is much more common among flu patients ...