Myth: The color of your snot can predict how sick you are
It may sound gross, but it’s a commonly held belief that the color of your mucus can tell you a lot about your health. Green or yellow mucus seems to hint at an infection—a tissue full of green goo makes us feel that there must be something seriously wrong. But actually, the color of your mucus—which was once considered a telltale sign of a bacterial infection—won’t reveal very much in the way of a cold or flu. “A decade ago doctors almost always used the color of your mucus as a way of determining whether you had a bacterial infection,” says Dr. Mirwaldt. “But overwhelmingly, almost all colds are viral colds.” It’s more likely that the color of your mucus is related to the foods you’ve eaten or chemicals you’ve ingested, says Dr. Mirwaldt.