If you suddenly come down with cold-like symptoms, it's possible you may have caught a virus. But when allergy season seems to get worse and worse every year, how can you tell if you're dealing with a common cold or seasonal allergies? To help you differentiate between a cold and allergies, we asked immunologists to weigh in on a few key differences. Read on to get their advice, and take our quiz at the end to help determine whether you might have a cold or allergies yourself.