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The flu is a respiratory illness caused by influenza viruses that infect the nose, throat and lungs â but its effects can be felt through the whole body. The flu is a highly contagious viral infection of the respiratory tract. The symptoms of flu and colds are similar, but flu symptoms come on suddenly, Flu Symptoms.
You usually don't get a fever with a cold. If you do, it may be a sign you've got the flu or an infection with a bacteria. For the first few days that you're sick, your runny nose will be watery, but it turns thicker and darker after that. You may also get a mild cough that can last into the second week of your cold.