A very obvious symptom of oral ulcers is pain, which severely affects the patient's life, especially when abstaining from spicy foods. So how should oral ulcers be treated? First, the principle is to use local anti-inflammatory treatments to relieve oral pain and promote the healing of the ulcers. Generally speaking, the acute phase can be quite painful. Local medication can be used, including some pain relief medications. These can be appropriately applied to the ulcer site and reapply twice to achieve temporary pain relief. Generally, we can eat more fruits and vegetables and appropriately supplement water to keep bowel movements smooth and the mouth moisturized. Avoid excessive fatigue, strengthen physical exercises to enhance immunity, and locally use pain relief and anti-inflammatory medications. Some powders that can be applied to the ulcer site also promote healing. For those with recurrent systemic episodes, medications that enhance resistance and appropriate supplements of vitamin C can be used. (Medications should be used under the guidance of a doctor.)