Causes of throat blisters include physical injury, herpes pharyngitis, lymphoid follicular hyperplasia and so on. 1. Physical injury: such as eating hard things, eating too hot food, these physical factors lead to damage to the mucous membrane of the laryngopharynx and there will be blisters. 2. Pharyngitis: viral or bacterial infection can lead to herpes in the pharyngeal isthmus, which is manifested as small grayish-white blisters on the mucous membrane of the pharyngeal isthmus. 3. Lymphoid follicular hyperplasia: acute pharyngitis, acute tonsillitis, chronic pharyngitis, gastroesophageal reflux, etc. can lead to lymphoid follicular hyperplasia in the pharynx, with protruding vesicular tissue on the surface of the mucosa. Throat blisters may also have other causes, it is recommended to improve the examination, to clarify the cause of the disease.