Can Allergies Ever Turn Into a Cold, or Is That a Myth?

If you've been dealing with a runny, itchy nose and congestion for a few weeks now, it's easy to wonder whether it's the pollen or ragweed blooming outside that's making you feel sick or an actual illness. It can be hard to tell the difference between a cold and allergies, especially when so many symptoms overlap and the cooler months often mean more germs are floating around. But...can allergies ever turn into a cold?