Frequent oral ulcers are mostly the manifestation of recurrent aphthous stomatitis, which is a chronic recurrent oral mucosal disease, the specific causes are as follows: 1, genetic factors: many patients with recurrent oral ulcers have a genetic family history; 2, immune and psychiatric factors: the patient’s own immune function defects or immune dysfunction, or mental stress, stress, sleep deprivation, anxiety, irritability, etc., resulting in the body immunity Dietary and nutritional factors: eating spicy and irritating foods can easily trigger oral ulcers, and vitamin and trace element deficiencies, such as a lack of vitamin B2 and zinc, can lead to recurrent oral ulcers; 4. Infections and endocrine factors: they may be related to viral infections, abnormal levels of female sex hormones, etc.; 5. Local trauma: such as eating sharp foods and biting the oral mucosa can also lead to oral ulcers. Local trauma: such as eating sharp food, accidentally biting the oral mucosa, etc. can also lead to mouth ulcers; 6, the underlying disease: for example, suffering from leukodystrophy or systemic lupus erythematosus, there can be recurrent mouth ulcers.