Which vitamin deficiency causes mouth ulcers?

Oral ulcers are usually closely related to deficiencies in B vitamins and vitamin C. The B vitamins, especially B2, B6, and B12, help maintain the health of oral mucosa and promote cell repair and metabolism. If these vitamins are insufficient in the body, the resistance of the oral mucosa may decrease, leading to ulcers. Vitamin C has antioxidant properties, enhances immunity, and accelerates wound healing. When the body lacks vitamin C, oral tissues become more susceptible to damage, increasing the likelihood of ulcers. In addition, deficiencies in other nutrients, such as iron or zinc, may also be associated with oral ulcers.

To prevent and improve oral ulcers, it is recommended to consume more foods rich in B vitamins and vitamin C in your daily diet. For example, whole grains, lean meats, eggs, and milk are rich in B vitamins, while citrus fruits, strawberries, tomatoes, and leafy green vegetables are high in vitamin C. Avoiding excessive fatigue and mental stress and maintaining a regular lifestyle can also help reduce the occurrence of ulcers. If oral ulcers recur frequently or fail to heal for a prolonged period, timely medical consultation is advised for examination and targeted nutritional supplementation under a doctor's guidance.