Common cold or sinusitis?

How do you know if what you have is a Cold or a sinus Infection? Or does one cause the other? I've been having Colds almost every weekend lately, but accompanied with a pain between my eyes, So i guessed that it was Sinusitis, but how do you know for sure? And what treatment Will I need?
A cold always lasts around 10 days. Most likely you have a sinus infection, which needs to be treated with anti-biotics. Sinus infections don't go away on their on.

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