Fever or feeling feverish/chills
Cough
Sore throat
Runny or stuffy nose
Muscle or body aches
Headache
Fatigue or weakness
Sudden onset of symptoms
Nausea, vomiting, or diarrhea, especially in children
Symptoms that are more severe than a common cold
Positive flu test from a healthcare provider
Symptoms that start within 1 to 4 days after exposure to someone with flu
Trouble breathing, chest pain, confusion, or severe dehydration, which need urgent medical care