Blisters on fire in the mouth are caused by herpes simplex virus infection, which is a type of herpes on the lips and mouth, and in Chinese medicine this condition is known as fire. It is often caused by colds, fever, fatigue, lack of sleep, depression and other factors. What should we do when we have blisters on fire? First, drink more water, patients with mouth ulcers drink more water is good for treatment, can keep the mouth moisturized, reduce pain. Secondly, pay attention to oral hygiene, avoid damage to the oral mucosa, the mouth is too dry there will be a burning sensation, and secondly, drugs, diseases and radiation therapy and other factors will affect the normal secretion of salivary glands. Second, pay attention to diet. Frequent mouth ulcers should pay more attention to the usual diet, whether it is allergic or sensitive to a certain food, pay attention to check your diet, from new foods to new medicines, beverages, toothpaste and chewing gum, etc. If you have recently eaten a new food or used a new product, you can try to try to stop using it to see how it works. Thirdly, food therapy, iron deficiency or vitamin B deficiency can cause a burning sensation in the mouth, try supplementing with vitamin B compliant vitamins, the dosage should be referred to the product labeling or doctor’s orders.