Despite these terms being used interchangeably, a ‘cold’ and the ‘flu’ are VERY different in 3 main ways: symptoms, duration & severity.  Common Cold  Onset gradually, usually resolve within 7 to 10 days, and are milder in intensity with symptoms such as sore throat, coughs, runny nose, phlegm & fatigue.  Influenza (‘Flu’)  Onset quickly, typically last 1-2 weeks, and are more severe in intensity leading to risks of complications (i.e. pneumonia). Symptoms include more severe forms of those experienced during a cold, often also characterised by a fever, shaking chills, muscle & body aches, and a ‘hacking’ cough.  If you suspect you have the flu, it is best to seek medical advice from your trusted healthcare professional.