Snot is just a form of mucus, a slimy secretion produced by the mucus membranes which line all external cavities of the body exposed to the outside environment. The job of mucus is to lubricate and protect these parts of the body.

Where does snot come from and why is there so much?

Most of the mucus that people sneeze out comes from the mucosal glands lining the nasal passages, Lebowitz said. People often think it's also coming from their sinuses, but in fact only a very small amount of mucus is produced in the sinuses, he said.

Does snot come from your brain?

Simply put, boogers are your body's way of getting rid of extra snot. But in case you heard some tall tales about them as a kid, here's what boogers are NOT: dead brain cells draining out of your skull. cerebrospinal fluid (CSF) leaking out of your spinal cord.