Blisters on the tongue of dialysis patients may be caused by physiological factors such as bites and burns, or by diseases such as oral herpes simplex and oral ulcers. 1. Physiological factors: If a dialysis patient bites his tongue accidentally while eating or burns his tongue by eating too hot food, it may lead to blisters on the tongue, which may cause the patient to suffer from tongue pain and tongue swelling. 2. Oral herpes simplex: if the patient is infected with herpes simplex virus type I in the mouth, it will easily induce oral herpes simplex, resulting in symptoms such as tongue blisters and itching of the affected area. 3. Oral ulcers: If the patient does not do a good job of oral hygiene care or lack of zinc, iron and other trace elements in the body, it may induce oral ulcers, so that the patient has a long tongue blisters, ulcers, pain and other symptoms. Dialysis patients body immunity is lower, the chance of mouth ulcers will also increase. If dialysis patients have blisters on their tongues, it is recommended that they go to the hospital to get a clear picture of the cause of the problem. Usually, the patient should take good care of oral hygiene and avoid eating irritating foods such as pepper and mustard.