Mouth ulcers can be caused by nutritional deficiencies, low immunity or lack of vitamins or trace elements, etc. Recurrent mouth ulcers are called recurrent mouth ulcers. In addition to the above reasons, some diseases such as Leukoaraiosis can also cause mouth ulcers. For general ulcers, you can rinse your mouth regularly with salt water or mouthwash, do not eat spicy, stimulating food, and eat a light diet. Drink more water, eat more fruits and vegetables rich in vitamin B and vitamin C, and take oral vitamins if necessary. Oral drugs to improve resistance, such as transfer factor, thymidine and so on. Topical topical medications, such as iodine glycerin, can be used to provide astringent, anti-inflammatory and pain relief. If the ulcers are caused by certain diseases, such as the above mentioned leukoaraiosis, it is necessary to treat the primary disease. When the primary disease is treated, the mouth ulcers will also improve or heal.