Why does my child frequently develop mouth ulcers?

Most people are aware that oral ulcers (aphthous stomatitis) are a relatively common mucosal disorder of the mouth—not only affecting adults but also children, who may experience recurrent episodes. So, what causes frequent oral ulcers in children?

Why Do Children Frequently Develop Oral Ulcers?

Common causes of recurrent oral ulcers in children include: Micronutrient deficiencies: Many children have underdeveloped immune systems and tend to consume excessive sweets, cold foods, spicy dishes, and fried foods, while insufficiently eating vitamin-rich vegetables and fruits. This may lead to deficiencies in vitamin A and vitamin B₂. Additionally, inadequate intake of red meat and animal liver—rich sources of essential trace elements such as zinc and iron—can predispose children to recurrent oral ulcers. Oral infections: After consuming candies or other sugary foods, children often fail to rinse their mouths promptly or brush their teeth thoroughly twice daily. Residual food particles foster bacterial growth in the oral cavity, increasing susceptibility to infection—and frequently triggering oral ulcers.

Patients should avoid pungent foods such as scallions, ginger, leeks, garlic, chili peppers, black pepper, beef, mutton, and dog meat, as well as “heat-inducing” or overly hot foods. Smoking, alcohol, coffee, and other stimulating beverages are strictly prohibited. Diet should consist of soft, easily digestible foods; severely affected individuals may require semi-liquid meals. Avoid excessive consumption of acidic, alkaline, spicy, or fried foods. Increase intake of zinc-rich foods—such as oysters, animal liver, red meat, eggs, and peanuts—to promote wound healing. Emphasize fresh, light vegetables and minimize consumption of rich, greasy, or heavily processed foods. Also increase intake of foods high in vitamin B₁, vitamin B₂, and vitamin C, which support ulcer healing.

Recurrent oral ulcers can significantly impact a child’s health; therefore, parents must not take them lightly. If a child develops oral ulcers, prompt medical evaluation is essential to identify the underlying cause and initiate targeted treatment. We hope this article has been helpful to you!