The symptoms of H1N1 flu are similar to seasonal flu, but may include additional symptoms such as vomiting and diarrhea.

Symptoms of Seasonal and H1N1 Flu:

Seasonal Flu

All Types can cause:

Fever
Coughing and/or sore throat
Runny or stuffy nose
Headaches and/or body aches
Chills
Fatigue

H1N1 Flu

Similar to seasonal flu, but symptoms may be more severe.

There may be additional symptoms. A significant number of H1N1 flu cases:

Vomiting
Diarrhea

Emergency Warning Signs - If you become ill and experience any of the following warning signs, seek emergency medical care.

Emergency warning signs in children:

Fast breathing or trouble breathing

Bluish or gray skin color
Not drinking enough fluids
Severe or persistent vomiting
Not waking up or not interacting
Being so irritable that the child does not want to be held
Flu-like symptoms improve but then return with fever and worse cough

Emergency warning signs in adults:

Difficulty breathing or shortness of breath
Pain or pressure in the chest or abdomen
Sudden dizziness
Confusion
Severe or persistent vomiting
Flu-like symptoms improve but then return with fever and worse cough