Recurrent mouth ulcers may indicate a deficiency in certain nutrients, such as vitamin B12, iron, or folic acid.

Generally, frequent mouth ulcers are usually associated with deficiencies in B vitamins, vitamin C, zinc, iron, folic acid, and other nutrients. The specific analysis is as follows:

1. B Vitamins: Vitamins B2 and B12 are involved in mucosal repair. When deficient, the oral mucosa is prone to damage and ulcers may develop. This often accompanies angular cheilitis and lip inflammation. The frequency of mouth ulcers can decrease after supplementation.

2. Vitamin C: Vitamin C promotes collagen synthesis and maintains mucosal integrity. When deficient, the mucosa's ability to repair itself declines, making ulcers more likely. Symptoms may also include bleeding gums and dry skin.

3. Zinc: Zinc plays a role in tissue regeneration and immune regulation. Deficiency can hinder the repair of oral mucosa, making ulcers difficult to heal. It may also cause reduced taste sensitivity and lowered immunity, increasing the risk of recurrent mouth ulcers.

4. Iron: Iron is an essential element for blood formation. Deficiency leads to insufficient nutrient supply to the mucosa, making oral mucosal damage and ulcers more likely to occur. Common accompanying symptoms include pale complexion and fatigue associated with anemia; ulcers may gradually improve with iron supplementation.

5. Folic Acid: Folic acid participates in cell metabolism and repair. Deficiency impedes the renewal of oral mucosal cells, making ulcers more likely. This is often related to insufficient intake of leafy green vegetables in the diet; supplementation can promote mucosal repair.

In daily diets, it's important to maintain balance, eating more fresh fruits and vegetables, lean meats, eggs, and ensure comprehensive nutrition. If mouth ulcers recur frequently, consult a doctor for guidance on appropriate supplementation of deficient nutrients to reduce ulcer occurrences.