Whether your mucus is yellow, green, red, or brown, this expert advice will help you understand what each snot color means and when to call a doctor.

The color of your mucus can reveal some surprising things about your health. Here's what your mucus color means, according to experts.

Here, doctors break down the meaning of your mucus color (what comes out when you blow your nose or cough up)and when you should see a healthcare professional.

What does yellow mucus mean? Yellow mucus means your body's immune system has been activated, which can change the color or consistency of your mucus, according to the Cleveland Clinic.

Productive coughs produce phlegm or mucus, helping clear airways of infection or irritants. The color and consistency of expelled mucus provide important diagnostic information.

The color of your mucus can reveal some surprising things about your health. Here's what your mucus color means, according to experts.