Oral ulcers always occur in the oral cavity is the typical clinical manifestation of recurrent oral ulcers, the etiology of recurrent oral ulcers is complex, mainly the following points: 1, local irritation factors such as stumpy crowns, stumpy roots, etc., long-term repeated stimulation of the oral mucosa, resulting in traumatic oral ulcers, the need to remove the local stimulation in the oral cavity, or else there is a possibility that it may lead to the occurrence of malignant oral ulcers and oral cancer. 2, genetic factors, the parent If they are patients with recurrent oral ulcers, their children are more prone to the disease than others because of individual differences.3, mental and psychological factors, long-term mental tension, stress, fatigue is also prone to the occurrence of recurrent oral ulcers.4, nutritional factors, nutritional deficiencies in the organism, lack of proteins, vitamins, microelements and so on can easily lead to recurrent oral ulcers.5, irregular work and rest, lack of sleep can also lead to recurrent oral ulcers. The most important thing to remember is that you can’t have a good night’s sleep.