What the color of your snot can reveal about your health

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Clear snot is generally a good thing, but too much of it can be a warning that something's brewing.

Clear snot is generally a good thing, but too much of it can be a warning that something's brewing.
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White snot signals that things are clogged up.

White snot signals that things are clogged up.
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Yellow snot is a sign your body is fighting to keep you healthy.

Yellow snot is a sign your body is fighting to keep you healthy.

Green snot is probably an indication that something isn't right.

Green snot is probably an indication that something isn't right.
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Red snot doesn't mean you're sick.

Red snot doesn't mean you're sick.

Brown snot can be a sign of irritation or pollution.

Brown snot can be a sign of irritation or pollution.
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Black snot might be a reason to call the doctor. Or it could just mean you've been breathing in smoke.

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.