Symptoms of Flu-like Illness Back
Seasonal Influenza and Pandemic Influenza (pH1N1) symptoms are very similar. Symptoms include:
Recent onset of Cough +
Recent onset of Fever +
One or more of the following:

Headache
Sore Throat
Muscle/Joint Aches and Pains
Extreme Fatigue
Note: Nausea, vomiting, and diarrhea are NOT common symptoms of influenza in adults. However, children may have these symptoms in addition to the respiratory symptoms.
Fever may not be present in elderly people and those with immunodeficiencies.