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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 Onset of Symptoms: Cold viruses take about three days (from the time of infection) to cause symptoms. 2  The sneezing, watery eyes, etc., from an allergy can happen as soon as you are in contact with the allergen. 3  Allergy Symptom Characteristic: Allergies never cause a fever or body aches. Allergy Symptom Characteristic: Allergies never cause a fever or body aches. 2  The following symptoms are more common in allergy sufferers (though can sometimes be associated with colds, too): itchy, watery eyes; clear mucus that doesnât turn yellow; and symptoms that are triggered when seasons change.