What causes recurrent oral ulcers?

The causes of recurrent oral ulcers are complex and varied, mainly including the following points: 1. Genetic factors: Oral ulcers, especially recurrent types, have clear genetic factors. If parents or close relatives have a history of recurrent oral ulcers, their children are also prone to develop them. 2. Immune factors: The occurrence of oral ulcers is closely related to immune function. Patients with immune deficiencies or weakened immune systems are more likely to experience recurrent oral ulcers. 3. Nutritional deficiencies: Long-term picky eating or unbalanced nutrition leading to deficiencies in vitamins (such as B-complex vitamins, vitamin C) and trace elements (such as zinc, selenium) is also an important cause of recurrent oral ulcers. 4. Psychological factors: Long-term stress, anxiety, or excessive mental pressure may also lead to recurrent oral ulcers. 5. Unhealthy lifestyle habits: Poor oral hygiene, unhealthy eating habits (such as long-term consumption of spicy or irritating foods), and irregular作息 (作息 should be translated as "作息" here, but in English, it could be expressed as "lifestyle routines" or "sleep patterns") may also trigger or worsen oral ulcers.