If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker ...

Ever wondered why the color of your snot is different when you're sick? You're probably not the first person to ask this question. There are actually many reasons why your snot's changes color ...

Ever wondered why the colour of your snot is different when you’re sick? You’re probably not the first person to ask this question. Mucus is produced by the tissues lining our nasal passages.

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond ...