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The easiest way to tell the difference between the two is how long they last â which unfortunately doesnât help when symptoms first strike! A common cold usually lasts no longer than ten days, while allergies can pester people for months on end.
It's a different story with allergies. They're caused by an overactive immune system. For some reason, your body mistakes harmless things, such as dust or pollen, for germs and attacks them. When that happens, your body releases chemicals such as histamine, just as it does when fighting a cold. This can cause a swelling in the passageways of your nose, and you'll start sneezing and coughing. Unlike colds, allergies aren't contagious, though some people may inherit a tendency to get them.