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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.
With seasonal allergies, the onset of symptoms â the sneezing, stuffy nose and itchy eyes â occur immediately after exposure to pollens in spring, summer or fall. If symptoms tend to show up the same time every year, it may well be seasonal allergies rather than a cold. [ 9 Weirdest Allergies ]. Duration of symptoms matters. The symptoms of a cold typically last three to 14 days, but allergy symptoms last longer, usually for weeks, as long as the person is exposed to pollen, Rachid said.