There are many reasons for white tongue, such as physiological factors, oral diseases, chronic diseases and so on. 1. Physiological factors: the human tongue itself will have part of the tongue moss cover, daily not pay attention to oral and tongue hygiene and cleanliness, will lead to a large number of tongue moss covered in the tongue, resulting in the phenomenon of white tongue. 2. Oral diseases: oral leukoplakia, oral candida infection, etc., can cause the phenomenon of white tongue. 3. Chronic diseases: chronic bronchitis, chronic nephritis, chronic pelvic inflammatory disease, etc., will also appear in the phenomenon of white tongue and thick tongue. There are many reasons for the white tongue, after the symptoms, it is recommended that the patient go to the hospital in time to improve the examination, a clear diagnosis, follow the doctor’s instructions to take standardized treatment, do not ignore the disease, delay the condition.