Well the common cold is so common because it's actually a set of symptoms derived from infection of the upper respiratory tract. It can be any one of hundreds of viruses that cause the infection. And because it's a virus, there's no treatment for it. You can only treat the symptoms - and since they're the same, you end up with common treatments for the common cold.
Read more about the science behind the common cold, including why it likes winter so much.
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