To use the Symptom Checker, choose the symptoms that you are experiencing from the list to the right. After you've checked off your selections, click on the Next button to see your results.
In some cases, you may be prompted for more information about your symptoms.
DISCLAIMER: This is not a substitute for a professional, on-site medical diagnosis. However, you can use the printable symptoms results for discussion with your doctor or other healthcare professional during your visit to aid in a professional diagnosis.
Know the F.A.C.T.S.
Flu symptoms can be mild or severe, and can come on suddenly — be sure you know your flu treatment options so you can be prepared. Symptoms generally appear 1 to 4 days after exposure to the virus.
Symptoms of the flu include chills, fever, aches, and tiredness.
The common symptoms of the flu include:
- Fever (100°F or greater)
- Muscle aches
- Runny nose (more common in children than adults)
If you have one or more of these
symptoms, it could be the flu.
Prescription antivirals can shorten the duration of the flu if taken within 12-48 hours of first symptoms. So act fast.
Flu Fighter Coloring Book
Track the Flu
Enter your ZIP code below to track the flu level in your area.
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Stop the Flu
There are prescription medicines that can help prevent you from getting the flu — or shorten the duration if you already have it.
Learn more ›
Are You “That Guy”?
If you think you have the flu, do the right thing. Watch the video ›
Sponsored by the NFID (National Foundation for Infectious Diseases)
Tips to Stay Flu-Free
Good preventive health habits, an annual flu vaccine, and prescription antivirals can help keep you and your family flu-free — all year long!
Learn more ›
Get FluF.A.C.T.S. Alerts
Is It Flu?
You have sudden fever, aches, chills, and tiredness.
What to do?
Check your symptoms ›