Fever in the mouth is caused by endocrine dysfunction if it occurs in menopausal or postmenopausal women; in the case of oral mucosal dryness syndrome, the disease will cause impaired function of salivary glands, leading to a serious decline in saliva secretion, causing extreme dryness in the mouth and a burning sensation, along with a series of symptoms, such as numbness of the tongue and impaired sense of taste. Fever inside the mouth may also be suffering from bacterial stomatitis, which is caused by bacterial infection, resulting in redness, swelling and erosion of the mucous membrane inside the mouth. In addition, if there are multiple ulcers on the oral mucosa, the symptoms of intraoral fever can also be present due to the congestion, redness, swelling, ulceration, and pain of the mucosa caused by the ulcers. Intraoral dental disorders, such as suffering from pulpitis, apical periodontitis, periodontitis, and wisdom tooth pericoronitis, can also cause fever in the mouth due to the swelling and pain in the mouth and the increase of inflammatory secretions.