What vitamin deficiency causes mouth ulcers?
Jun 08, 2022
Source: Cainiu Health
Dr. Liu Chao
Introduction
Oral ulcers are commonly associated with deficiencies in B vitamins—particularly vitamin B12, folate, niacin—and vitamin C. However, it is important to note that other contributing factors include immune dysfunction, infections, psychological stress, and genetic predisposition; vitamin deficiency is often a secondary or contributory factor rather than the primary cause. For individuals experiencing sudden-onset oral ulcers, vitamin supplementation may offer some therapeutic benefit, though the extent of improvement varies among individuals.
Under normal circumstances, oral ulcers are often associated with deficiencies in B-complex vitamins—particularly vitamin B12, folate, niacin, and vitamin C. A detailed analysis follows:
Deficiencies in vitamin B12 and folate impair DNA synthesis, thereby hindering the renewal of oral mucosal epithelial cells and reducing mucosal repair capacity. Such deficiencies are commonly observed in vegetarians, individuals with gastrointestinal disorders, or those with postoperative malabsorption syndromes. In addition to oral ulcers, affected patients may also present with glossitis and anemia. Vitamin B2 (riboflavin) and niacin participate in cellular redox reactions; their deficiency disrupts mucosal metabolism and increases susceptibility to ulcer formation—commonly seen in individuals with monotonous diets or chronic alcohol use. As an antioxidant, vitamin C promotes collagen synthesis and maintains vascular integrity. Its deficiency compromises mucosal barrier function, rendering the mucosa more vulnerable to injury and delaying healing—a classic manifestation seen in scurvy, where gingival bleeding and oral ulcers frequently co-occur.
However, it is important to note that other factors—including immune dysregulation, infection, psychological stress, and genetic predisposition—also contribute significantly to oral ulcer development. Vitamin deficiencies typically act as contributing or secondary factors rather than primary causes. While vitamin supplementation may offer some therapeutic benefit for newly onset oral ulcers, clinical response varies considerably among individuals.
If oral ulcers recur frequently or persist for more than two weeks without resolution, prompt medical evaluation is recommended to identify underlying etiologies and avoid inappropriate treatment or disease progression.
