It's something your mom, nana, grandma, gigi, or auntie told you -- wild changes in temperature will make you sick.

But, is it true or an urban myth?

According to the Washington Post, cold-like symptoms like runny noses and upper-respiratory irritation can increase with a temperature fluctuation because of increased allergies.

Allergies can make you more susceptible to bacterial infections however, so while the cold won't give you a cold -- it can lower your immune system. So if you're around someone who's already sick, you're more likely to catch it.

Keep up good hand washing practices, and clean common surfaces often.