Burning mouth should refer to burning mouth syndrome, pain everywhere in the mouth may be burning mouth syndrome, may also be caused by oral ulcers, pulpitis and other diseases, should go to the hospital for clarification. 1. burnt mouth syndrome: burnt mouth syndrome refers to the oral mucosa, burning pain as the main manifestation of a group of symptoms, often not accompanied by obvious clinical signs of damage, and there is no characteristic histological changes. 2. Canker sores: Canker sores are round or oval painful ulcers on the mucous membranes of the lips, palate, and tongue and cheeks in the oral cavity, and some patients may be accompanied by systemic symptoms such as low-grade fever, malaise, irritability, and headache. 3. pulpitis: pulpitis is an inflammatory lesion of the dental pulp, the main clinical manifestation of pain, pain often radiates to the affected teeth on the same side of the maxillary and mandibular teeth or head, temporal and facial. It is recommended that when patients have symptoms of pain everywhere in the mouth, they should seek medical treatment in time and under the guidance of the doctor.