Is it flu or just a cold? Diagnosis can be difficult

USA TODAY

Flu symptoms can come on quickly (3 to 6 hours) and include fever, headache, body aches, fatigue and cough. If you're sick, see a doctor and don't go to work or school.

Is it flu or just a cold? Diagnosis can be difficult

Is it flu or just a cold? How do you tell? Doctors say if it's flu -- real influenza, not just what everyone calls "the flu" -- you'll know it.

USATODAY.COM