If the patient has blisters on the back of the tongue, it is recommended to go to ENT and stomatology for a systematic examination of the following clinical diseases. 1. Lymphatic follicular hyperplasia at the root of the tongue, which is very common because there is a lot of lymphatic tissue at the root of the tongue, and when the patient has chronic pharyngitis, it is easy to have a large number of lymphatic follicular hyperplasia at the root of the tongue. For this condition patients may experience discomfort such as foreign body sensation in the pharynx. The clinical application of pharyngitis medication may be effective, and very few patients can be treated with plasma radiofrequency ablation surgery if medication does not work. 2. Some patients have papillomas at the base of the tongue, which appear as new organisms with unsmooth granular surfaces, and can be treated with surgery once found. 3, Some patients have ectopic thyroid gland at the root of the tongue, which can be detected clinically through relevant iodine 131 examination.