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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.
1 Duration: Colds donât usually last longer than 5 to 7 days, but allergies can last as long as youâre exposed to the thing youâre allergic to, the allergen. 2  Onset of Symptoms: Cold viruses take about three days (from the time of infection) to cause symptoms.