Medically reviewed by Brian T. Luong, DMD Anemia (a lack of healthy red blood cells) can produce a swollen and painful tongue ...

Folic acid or vitamin B12 deficiency can cause your tongue ... Signs like a red, smooth, black, or sore tongue and bumps or soreness may be signs of several infections and illnesses.

The tongue is covered in lots of little bumps. On the walls and grooves of these bumps are thousands of tiny taste buds, too small for the human eye to see. The buds sense the taste of everything ...