A tongue that is sometimes white and sometimes yellow may be caused by dampness-heat in the spleen and stomach (the spleen and stomach feeling dampness-heat evil) or liver depression and stagnation of qi (poor transportation of qi and blood in the liver, emotional depression), and so on. Specifically, one should seek timely medical consultation, clarify the cause of the disease and seek professional treatment. 1. Damp-heat in the spleen and stomach: If the tongue is white and yellow, and there are also symptoms such as dry mouth, bitter taste in the mouth, short and red urine (small amount of urine, dark yellow in color), constipation, etc., it may be due to damp-heat in the spleen and stomach. It is recommended to take medicines to clear dampness and heat in the spleen and stomach under the guidance of a doctor, such as Huanglian Qingstomach Pill. 2. Liver depression and stagnation of qi: If accompanied by love of long sighs, chest and diaphragm full of tightness, etc., may be due to liver depression and stagnation of qi, the patient can be recommended by the doctor to use Chai Hu Shuo Liver San and other drugs to treat. It is recommended to consume more fresh vegetables and fruits, the diet should be light, avoid stimulating greasy food, and do some exercise to help gastrointestinal peristalsis. It is not advisable to self-medication, so as not to delay the condition.