does yellow mucus mean infection
- You might have heard that yellow or green mucus is a clear sign that you have an infection, but despite that common misperception, the yellow or green hue isn't due to bacteria. When you have a cold, your immune system sends white blood cells called neutrophils rushing to the area.These cells contain a greenish-colored enzyme, and in large numbers they can turn the mucus the same color. But you can have perfectly clear mucus and have a terrible ear and sinus infection , Kao says.If you do have an infection, you'll likely also have other symptoms, such as congestion, fever, and pressure in your face, overlying the sinuses, Johns says.1 | 2 | 3 | 4. Continue reading below...hen you have a cold, your immune system sends white blood cells called neutrophils rushing to the area. These cells contain a greenish-colored enzyme, and in large numbers they can turn the mucus the same color. But you can have perfectly clear mucus and have a terrible ear and sinus infection , Kao says.