Difference Between Colds and Allergies
White says that one of the most common questions that she is asked is whether they have a cold or allergy — and what's the difference anyway? And it's a tricky one. Colds and allergies can have very similar symptoms, even itching. If you seem to get a cold at the same time of year, every year, it might be seasonal allergies because you are reacting to something, like pollen, that works on a yearly cycle. If you're starting to feel under-the-weather as someone who had similar symptoms is feeling better, that might be a cold because people allergies aren't contagious. One trademark of allergies that might reduce confusion is that, although called "hay fever," allergies do not cause fever.