Oral ulcers and cavity ulcers are mostly caused by bacteria and viruses in the mouth, or lack vitamins and certain substances needed by the human body. Treatment: Adults take orally amoxicillin tablets, vitamin B2 tablets and vitamin C tablets, three times a day, once for five days. Avoid spicy and spicy foods, such as peppers and ginger. When taking vitamin B2, the urine color is dark yellow, which has no effect on the body. This is a normal phenomenon. Chinese medicine: when the heart is full of fire, the oral ulcer is red, swollen, painful, upset, thirsty, constipation, frequent urination and tingling. For those with red tongue coating, Akebia Akebia 10g, Gentiana 10g, Branches 15g, 20g of Radix Rehmanniae, 30g of Talcum and 20g of Yunnan Wheat. Excessive fire due to yin deficiency is characterized by slight pain in oral ulcer, dry mouth, emaciation, upset and insomnia, dry stool at ordinary times, and pale tongue with little or no coating: Cortex Phellodendri 10g, Radix Rehmanniae 15g, Rhizoma Anemarrhenae 10g, Rhizoma Alismatis 15g, and Rhizoma Dioscoreae10g. You can also eat Wang Laoji granules, Xiasangju granules and Banlangen granules. The ulcer surface can be coated with boron powder, iodine glycerin, or cauterized with iodine. If the pain is severe, you can take 1 tablet orally or 1 tablet orally, which has analgesic effect. Precautions for patients with oral ulcer: 1. Avoid spicy, spicy, fried and stir-fried products, such as pepper, ginger, fried dough sticks, biscuits, biscuits, instant noodles and mutton. 2. Not partial eclipse, diversified diet. Eat more vegetables and fruits containing more vitamins, such as flat fruit, new vegetables, spinach, carrots and so on. Be cheerful, don't always think about annoying things, play more with friends and live a happy life every day. 4. Work hard in daily life, pay attention to rest, and don't stay up late surfing the Internet. 5. When the weather is hot and dry, you can use fresh Siraitia grosvenorii as tea leaves to soak in water, or you can use Ophiopogon japonicus, chrysanthemum, licorice and other ingredients to soak in boiling water. 6. Pay attention to oral hygiene and brush your teeth in the morning and evening.