Periodic mouth ulcers are clinically known as recurrent aphthous ulcers. The main treatments include removing the possible causes, such as regulating emotions, adopting a good lifestyle, regulating immune function, etc., and symptomatic treatments, such as relieving pain and promoting healing. 1. Remove the possible causes: the cause of recurrent aphthous ulcer is unknown, but it may be related to anxiety, mental stress, late night, abnormal immune function, etc. The corresponding treatment is to regulate mood, maintain a good lifestyle, and regulate immune function. Corresponding treatment is to regulate emotions and keep mood happy. Low immunity should strengthen physical exercise. Poor lifestyle such as staying up late and partial feeding should be corrected as much as possible. 2. Symptomatic treatment: For people who often have recurrent mouth ulcers, first use painkillers such as lidocaine gel for pain relief during an attack. You can also apply watermelon cream and other drugs to promote healing. Drugs should be used under the guidance of a doctor. Periodic mouth ulcers are recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.