There are many causes of white stuff like ulcers inside the throat, such as thrush, mucosal injury, and malignant tumors of the throat. 1. Thrush: Thrush is caused by oral candida infection, which can show the phenomenon of white stuff like ulcers inside the throat, accompanied by white patches on the inside of the lips. 2. Mucosal injury: Eating too sharp food, eating too fast, etc. may cause mucosal injury of the throat, and there is pseudomembrane growth during the healing process, so it will lead to the phenomenon of white stuff like ulcers inside the throat. 3. Malignant tumor of throat: If there is malignant tumor in throat, it will also lead to the phenomenon of white stuff like ulcer inside the throat, such as tonsil cancer, laryngeal cancer, hypopharyngeal cancer and so on, and there will be obvious pain at the same time. There are many other reasons why there are white things like ulcers in the throat, and it is recommended to go to the hospital in time to improve the examination and make a clear diagnosis after the symptoms appear.