Medically reviewed by Robert Burakoff, MD Mucus in stool is normal, but it's not usually visible to the naked eye. When it is ...

This type of infection can cause bleeding in the airways, and this blood makes the mucus and phlegm appear dark or black. According to the American Cancer Society, there were about 234,580 new ...

Guaifenesin, like Mucinex, helps clear mucus from your chest. It's a type of drug called expectorants, which thin the mucus and make it easier to cough up. What drinks clear mucus from the lungs?