This is the time of year we start talking about flu and respiratory illnesses. How can you tell the difference between a cold and the flu? A cold gives you runny nose, congestion, sore throat and cough. So does the flu though the flu also has headache, muscles aches and pains, fever, chills and sometimes chest pain. I have even heard people say their hair hurts! Both are contagious, both can lead to secondary illnesses, such as sinus, bronchial, pneumonia, ear infections and more.