Phlegm is naturally clear. So, if your phlegm is a different color, such as yellow or green, you may have a viral or bacterial infection. Brown, red, or black phlegm may be a sign of a more serious ...
Though it may be offputting, mucus is a vital part of the body's protection. The color of your boogers can help you figure out what's going on in your body. Here's what the color of your snot means, ...
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