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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.
Also see him if your cough doesn't get better after a few weeks. Your symptoms usually start between 1 and 3 days after you get infected with a cold virus. They typically last for about 3 to 7 days. By then the worst is over, but you may feel stuffed up for a week or more.he Start of a Cold. It usually begins with a sore throat, and before you know it, you've also got these symptoms: 1  Runny nose (clear and watery). 2  Sneezing. 3  Fatigue.