why is my tongue yellow
By Mayo Clinic Staff. Yellow tongue usually occurs as a result of a harmless buildup of dead skin cells on the tiny projections (papillae) on the surface of your tongue. Most commonly this occurs when your papillae become enlarged and bacteria in your mouth produce colored pigments. Also, the longer-than-normal papillae can easily trap cells that have shed, which become stained by tobacco, food or other substances. Mouth breathing or dry mouth may also be linked to yellow tongue. Other causes of a yellow tongue may include, for example: Black hairy tongue.
Yellow tongue â a yellow discoloration of your tongue â is usually a temporary, harmless problem. Most often, yellow tongue is an early sign of a disorder known as black hairy tongue. Rarely, yellow tongue may be a sign of jaundice, a yellowing of the eyes and skin, which sometimes indicates liver or gallbladder problems. Self-care is usually all that's needed to treat yellow tongue, unless it's related to another medical condition.