I started out just being nauseous alot and having frequent heartburn. A few days ago I was spitting into the sink and black phlegm came out. I was horrified. I look into my mouth and honest to god, my tongue was black and had this gross mettalic taste. I have never been a smoker and I have no idea why this gross thing is happening. I am now nauseous and can not eat much of anything. I have to admit, I am afraid to go to the doctor. I am really scard something is seriously wrong, but all I found on the internet is that smokers have this happen.
Individuals with "black hairy tongue" merely have a taller-than-normal forest of papillae. The extra height comes from an accumulation of keratin, which is the chief protein found in hair and skin. Normally, keratin sloughs continuously and gradually from mucous membranes and skin. (In fact, "discarded" skin cells are the chief constituent of house dust. There is a critter that makes its living by eating this stuff: the dust mite. People who are "allergic to dust" are usually just allergic to dust-mite poop!) In people with black hairy tongue, not enough keratin is sloughed (or, perhaps, too much keratin is being produced at the surface of the tongue).
No one knows for certain what causes black hairy tongue, but there are several well-known associations. ("Association" means, "We see A and B occurring together, but we're not sure whether A causes B.") Black hairy tongue is fairly common among smokers. It is also sometimes seen following treatment with antibiotics. Other associations with black hairy tongue include radiation therapy to the mouth, poor oral hygiene, frequent use of strong mouthwashes and frequent use of antacids.
it's just on the surface of my tongue. Almost like someone took a majic marker and colored it. nothing on sides or tip. It doesn't seem raised either, like hairy tongue, but I have been coughing more frequently so I think I should get my lungs checked. Thanks for all your comments.
This is very clearly a sign of an ulcer, especially that you require frequent antacid use. The metallic taste in your mouth is iron, a component of blood. Bleeding ulcers cause the "coffee ground" appearing particulates in your mucus. Those who have not studied medicine should probably refrain from answering forum questions.