Commissions do not affect our editors' opinions or evaluations. The term “black card” has come to symbolize an ultra-exclusive high-end credit card, referenced in pop culture as the ultimate ...

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 ...

A person’s poop may be black due to eating certain foods, such as licorice, taking iron supplements, or gastrointestinal bleeding. If people have blood in the stool, they may benefit from ...