Clear snot is generally a good thing, but too much of it can be a warning that something's brewing.
White snot signals that things are clogged up.
Yellow snot is a sign your body is fighting to keep you healthy.
Green snot is probably an indication that something isn't right.
next slide will load in 15 secondsSkip AdSkip AdRed snot doesn't mean you're sick.
Brown snot can be a sign of irritation or pollution.
Black snot might be a reason to call the doctor. Or it could just mean you've been breathing in smoke.
Julia Calderone wrote an earlier version of this post.