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A cough that is accompanied with mucus or phlegm (sputum), commonly called a "productive cough," is usually a sign that an infection has developed in the lungs. If you are coughing up mucus and phlegm and it persists, consult your physician.

Your mucus can also change color when you're sick. Green mucus is a sign that your body's immune system is at work. The color comes from a type of infection-fighting white blood cell. With cold or flu, mucus starts clear, then begins to darken as it gets thicker," Kemmerly says.

While coughing up phlegm is not pleasant, it serves a purpose and is a sign that your body is fighting off infection, or trying clear lung congestion. Excessive phlegm or chest mucus is often caused by viral or bacterial infections such as influenza, bronchitis and pneumonia.

Bloody sputum or spitting up blood or bloody mucus can come from common forms of infection in the lungs and airways, such as acute bronchitis or pneumonia. Bloody sputum can be a result of lung disease. Bloody sputum is also referred to as hemoptysis.

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.