The tongue is a little dark.

Tongue coating a little black, is caused by liver disease, you can go to the hospital to check liver function, and B-ultrasound examination. In peacetime can use chrysanthemum tea to conditioning, sometimes gastrointestinal dysfunction, may also cause tongue coating a little black phenomenon, this time can be under the guidance of a doctor, take some conditioning gastrointestinal function drugs to treat. At ordinary times, pay attention to eating habits, do not eat food that is not easy to digest, you can eat some foods rich in high quality protein, such as milk, eggs, these foods can enhance the body's immunity.