Loss of tongue coating may be caused by chronic lingual inflammation, tinea versicolor and gastrointestinal dysfunction. 1. Chronic Tongue Inflammation: Chronic Tongue Inflammation may occur when the patient lacks micronutrients. Chronic Tongue Inflammation may be related to a large amount of lack of nutrients such as iron and zinc in the body, or it may be related to low immunity. Patients will then experience symptoms such as loss of tongue coating, redness, swelling and pain. 2. Tinea versicolor: Tinea versicolor is caused by the abnormal keratinization of filiform papillae and fungiform papillae of the tongue mucosa epithelium, and patients will have symptoms such as shedding of tongue coating and swelling of the tip of the tongue. 3. Gastrointestinal dysfunction: due to the usual lack of attention to dietary hygiene, long-term spicy and stimulating food, too much food, irregular diet, which leads to gastrointestinal dysfunction phenomenon, the patient will appear the symptoms of tongue coating, some patients will also appear nausea and vomiting symptoms. When the patient has a detached tongue, it is necessary to go to the hospital in time to consult the doctor, after clarifying the cause of the disease, actively cooperate with the doctor’s treatment.