The flu is never fun. And chances are, you will feel pretty bad for at least a few days. But according to the CDC, if you notice any of the following signs in yourself or someone you are caring for, seek medical care right away:

Flu Emergency Warning Signs in Children:

• Fast breathing or trouble breathing
• Bluish skin color
• Not drinking enough fluids
• 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
• Fever with a rash

Flu 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

Reference
Center for Disease Control and Prevention. http://www.cdc.gov/FLU