Hello, It’s not always clear what causes mouth ulcers that keep returning, but triggers are thought to include:
stress and anxiety hormonal changes – some women develop mouth ulcers during their monthly period, eating certain foods – such as chocolate, spicy foods, coffee, peanuts, almonds, strawberries, cheese, tomatoes and wheat flour toothpaste containing sodium lauryl, and
vitamin deficiencies. Taking b-complex tablets eating fresh fruits and vegetables and green leafy vegetables, supplements vitamins. Avoid stress.