There are many causes of white ulcers on the inside of the throat in adults, such as herpes pharyngitis, fungal infections, recurrent aphthous ulcers, and mucosal injuries. 1. Herpetic pharyngitis: mainly an inflammatory disease of the pharyngeal isthmus caused by infections such as coxsackie virus. It manifests as fever, sore throat, and white ulcers on the inner wall of the throat. 2. Fungal infection: long-term use of antibiotic drugs may lead to fungal infections in the throat, thus leading to the appearance of pseudo-white membranes or white ulcers on the inside of the throat. 3. Recurrent aphthous ulcers: A lack of vitamins in the body can trigger recurrent aphthous ulcers, which can lead to the phenomenon of white ulcers on the inside of the throat in adults. 4. Mucosal damage: Eating too hot or hard food, or poor restorative body, may lead to damage to the mucous membrane of the throat, the formation of ulcers, which can lead to the white ulcers on the inside of the throat in adults. There are many reasons why adults have white ulcers on the inside of their throats, and it is recommended that they go to the hospital in time to take standardized treatment as prescribed by the doctor after the symptoms appear.