What causes mouth ulcers in the mouth?

The causes of oral ulcers are complex and varied, mainly including the following: 1. Immune factors: A decline in immunity, such as from staying up late for prolonged periods or excessive fatigue, may make the oral mucosa fragile and prone to damage and ulcers. 2. Nutritional deficiencies: Long-term inadequate nutrition intake, especially deficiencies in vitamins such as B12 and C, as well as trace elements, may lead to inflammation of the oral mucosa and subsequent ulcer formation. 3. Genetic factors: Recurrent oral ulcers are somewhat related to heredity; approximately 40% of patients have a family history of oral ulcers. 4. Diet and lifestyle habits: Irregular eating patterns, poor nutrition, consumption of excessively hot or spicy foods, and poor oral hygiene can all irritate the oral mucosa and trigger ulcers. 5. Other factors: Excessive mental stress, emotional fluctuations, and oral mucosal injuries caused by biting the inside of the mouth with teeth can also be potential causes of oral ulcers. If you have any concerns, please consult a relevant healthcare professional.