Mouth ulcers can eat watermelon in moderation. Mouth ulcers can have different degrees of mouth and tongue pain and affect eating, diet should pay attention to the taste of light, avoid spicy stimulation, thorny and bone, too hot food, eat more fresh vegetables and fruits to supplement vitamins. Watermelon can provide the body with a certain amount of water, sugar, vitamins, minerals and other nutrients, mouth ulcers can also eat watermelon, not much effect on the condition. But watermelon as a fruit nutrition is not complete, should be eaten in moderation, high blood sugar people need to control the amount of food. Mouth ulcers need to pay attention to rest, avoid contact with tobacco and alcohol, do not stay up late and overwork, such as ulcers larger and deeper need to consult a doctor.