Here is how to tell the difference between a cold and the flu:
Cold
Gradual onset of symptoms
No fever
Slight body aches
Headache uncommon
Runny nose, sneezing
Sore throat common
Hacking cough
Flu
Sudden onset of symptoms
High fever
Often severe body aches
Headache common
Sometimes runny nose, no sneezing
Sore throat uncommon
Dry cough