The whiteness and pain on both sides of the child’s tongue may be caused by vagrant lingual inflammation, thrush, mouth ulcers and other diseases. 1. Wandering lingual inflammation: this disease is also known as map tongue, the cause of which is not yet clear, and may be related to heredity, mental stress, B vitamin deficiency and other reasons. Typical symptoms are yellowish-white bands around the tongue in the lesion area, usually not accompanied by pain, but when eating acidic or spicy food will appear to stimulate pain, which can be manifested as the child’s tongue white and painful on both sides. 2. Thrush: the basic cause of this disease is the body’s immune system is reduced by Candida overgrowth and infection. Thrush is also easily induced by the long-term use of broad-spectrum antibiotics or glucocorticoids. Clinical symptoms are mainly white patches on the surface of the tongue, which may be accompanied by slight pain. 3. Mouth ulcers: the occurrence of this disease is related to heredity, mental stress, immunity decline, partiality, physical injury and other reasons, there will be white on both sides of the tongue and painful symptoms, may also be accompanied by low fever, fatigue and other symptoms. When you find that your child’s tongue is white and painful on both sides, you should go to the hospital to find out the cause.