Mucus in stool is normal, but it's not usually visible to the naked eye. When it is, you may notice stringy clear, white, or ...

it’s not a bad idea to do more research if you see mucus in your stool. Some causes are short-lived and may resolve on their own, like if you have had a bout of diarrhea or constipation.

When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves ...