Yellow tongue moss can be caused by eating loquat, taking medicines such as riboflavin, adipine, yellow lotus, etc., and the pigment adheres to the surface of the tongue, making the tongue moss yellow. According to TCM, yellow moss is the main evidence of internal and heat. Thick and greasy tongue moss may be seen in white spots in the oral cavity, lichen planus, discoid lupus erythematosus, aspergillosis, candidiasis, etc. There are also some patients with systemic chronic diseases with thick and greasy tongue moss, such as diabetes, anemia, chronic hepatitis, gastric ulcer, chronic enteritis, etc. According to Chinese medicine, thick and greasy tongue moss mainly reflects dampness in the middle jiao, spleen loss of health, and stomach heat steaming on the tongue, so yellow and greasy tongue moss can be examined by the stomatology department of a regular hospital. If there is no specific disease in the oral examination, you can also go to the Department of Traditional Chinese Medicine of a regular hospital for examination and treatment by looking, smelling, asking and cutting in Chinese medicine.