Oral ulcers refer to the erosion and inflammation of the mucous membranes in the mouth, a common ulcerative condition occurring on the mucous membranes of the oral cavity. They commonly appear on the inner side of the lips, tongue, underside of the tongue, cheek mucous membranes, vestibular groove, soft palate, etc. They may be accompanied by symptoms like bad breath, chronic pharyngitis, constipation, headaches, dizziness, nausea, fatigue, irritability, fever, and swollen lymph nodes. There are two types of conditions: one is recurrent mouth sores, also known as aphthous stomatitis; characterized by repeated outbreaks but heals without scarring. The other type is called periadenitis, where there is a red halo around the eroded area that heals with scarring. Therefore, it is advisable to rinse with saltwater regularly, maintain oral hygiene, consume zinc-rich foods, regulate emotions, avoid staying up late, smoking, and drinking. This can promote the healing of oral ulcers. Additionally, under the guidance of a doctor or pharmacist, some heat-clearing and detoxifying traditional Chinese medicines can be taken.