What causes yellow tongue hair?

Yellow tongue coating is mainly a hot image, considering that there is fire or heat in the patient's body. Thick tongue coating generally indicates that the disease is evil in the interior or phlegm and food accumulation. Therefore, if the patient's tongue coating shows yellow thickness, the reason is mostly damp-heat or phlegm fire or food accumulation and heat. If the patient complains with the symptoms of heart and lung and other upper energizer diseases, such as cough, asthma, palpitation, insomnia, etc., combined with other evidences, it is considered to be caused by phlegm fire, and drugs such as coptis root, scutellaria root, bupleurum root, platycodon root, tangerine peel and pinellia tuber are used for treatment. If the patient complains with middle and lower energizer diseases, such as constipation, vomiting, jaundice, etc., combined with other evidences, it is considered to be caused by damp-heat, and drugs such as Artemisia capillaris, Plantago seed, Cortex phellodendron and Rhizoma Atractylodis are commonly used for treatment. If the patient has overeating before, constipation knot situation, more think is food stagnation caused, treatment can be used rhubarb, immature bitter orange, magnolia bark and other drugs.