Snot gets it’s yellow (and eventually green) color a chemical in your white blood cells, which your body unleashes to fight infection. Yellow mucus is a sign that whatever virus or infection you have is taking hold. The good news? Your body is fighting back. The yellow color comes from the cells — white blood cells, for example — rushing to kill the offending germs. Once the cells have done their work, they’re discarded in your snot and tinge it a yellowish-brown.
Your illness may last anywhere from 10 to 14 days, but keep an eye on your nasal discharge.
If your immune system kicks into high gear to fight infection, your snot may turn green and become especially thick. The color comes from dead white blood cells and other waste products.
But green snot isn’t always a reason to run to your doctor. In fact, some sinus infection may be viral, not bacterial.
Still, if you’ve had your cold or infection for 12 days or more, it may be a good time to make an appointment. You may have a bacterial sinus infection or another bacterial infection that requires medication. Look for other signs you’re not getting better, like fever, headache, or nausea.
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