Oral blood blisters are commonly associated with oral ulcers. It is a blood blister that occurs on the oral mucosa and can range in size from rice grain to soybean, round or ovoid, with the ulcerated surface being a concave oral ulcer, surrounded by congestion, and can be painful due to irritating foods, and can generally heal spontaneously in one to two weeks. Recurrent oral ulcers are a kind of limited ulcerative injury of the oral mucosa characterized by periodic recurrence, which can heal spontaneously and can occur in any part of the oral mucosa. So what should be noted in the diet of mouth ulcers with blood blister symptoms? Nutrition principles: 1, to ensure the intake of B vitamins. 2, pay attention to the supplement lecithin: long-term do not eat egg yolk caused by “rotten mouth” and mouth ulcers. 3, to ensure the intake of high-quality protein is the necessary nutrients to repair mouth ulcer wounds. 4, eat more fresh vegetables, fruits, drink more water, supplement vitamins and trace elements supplements, to prevent and control mouth ulcers are helpful. 5, pay attention to oral hygiene recommendations: frequent ulcers, may wish to daily morning gargle with light salt water, may have some effect. Appropriate food: 1, the choice of meat, eggs and milk. Pork, pork liver, egg yolk, chicken, duck, oysters, etc., rich in vitamin B2, can promote ulcer healing and maintain the integrity of the mucosa. 2, the choice of vegetables. Celery, bean pods, lettuce, spinach, rape, chrysanthemum, lotus root, rich in crude fiber, cold in nature, has to keep the stool open, lead the fire down the work 3, the choice of fruit. Red fruit, strawberries, persimmons, oranges, rich in vitamin C, should always eat. Dietary contraindications: 1, avoid eating irritating condiments. Such as chili, vinegar, ginger, onion, star anise, etc.. These foods will not only induce pain, but also stimulate the ulcer surface, making it further expand. 2, avoid eating rough and hard food. Such as fried ribs, fried chicken legs, nuts and so on. Because these hard foods are easy to produce friction in the ulcer surface, aggravating the disease. 3, avoid eating chewing gum, chocolate, tobacco, alcohol, coffee, hot food and spicy barbecue, fried products, etc.. These are things that can easily trigger or aggravate the mouth ulcer. 4, avoid eating ground food. Such as minced bread, corn or potato chips, etc., because the ground food, easy to adhere to the ulcer surface, affecting the healing of the ulcer. 5, avoid eating food that is too hot. Boiling water or boiling soup does not kill the bacteria on the ulcer surface, but can cause irritation. Therefore, wait for the food to cool to room temperature before eating is the best choice.