What Does It Mean When Snot Is Yellow

The yellow color comes from the cells white blood cells for example rushing to kill the offending germs.

When your snot turns yellow it means your illness is progressing normally. When your mucus traps potential illness causing debris like pathogens that cause the common cold or flu your immune system. White blood cells and other cells from the immune system have come to fight the germs making you sick and some of them are now exhausted and being washed away by mucus. Your mucus usually turns yellow when your body is fighting an infection.

Once the cells have done their work they re discarded in your snot and tinge it a.