The common cold is a viral infection of your upper respiratory tract – your nose and throat. A common cold is usually harmless, although it may not feel that way. If it’s not a runny nose, sore throat and cough, it’s the watery eyes, sneezing and congestion or maybe all of the above. In fact, because any one of more than 100 viruses can cause a common cold, signs and symptoms tend to vary greatly.
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