8 Unmistakable Signs of the Flu

Cold & Flu Center


The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. Some people, such as older people, young children, and people with certain health conditions, are at high risk for serious flu complications. For this reason, it's important to know the symptoms so you can get treatment fast, both for your own sake and so you don't pass the disease on to others.

The telltale signs include:

Fever (usually high)

Headache

Extreme tiredness/fatigue

Dry cough

Sore throat

Runny or stuffy nose

Muscle aches

Stomach symptoms, such as nausea, vomiting, and diarrhea, can also occur but are more common in children than adults.


If you develop flulike symptoms and are concerned about your illness, consult your health care provider. This is especially important for those at high risk for complications from the flu virus, including people 65 and older, those with chronic medical conditions, pregnant women, and young children.