Many people overlook changes in their mouth as minor annoyances, but persistent symptoms like cracked lips, mouth ulcers, burning sensations or a smooth, swollen tongue may point to something much deeper. According to experts, vitamin B12 deficiency often shows up in the mouth first because oral tissues regenerate rapidly and require a constant supply of nutrients to stay healthy. When B12 levels begin dropping, the body may struggle to properly renew these fast-growing cells.
Low vitamin B12 levels can trigger inflammation throughout the mouth, leading to redness, soreness, altered taste, dry mouth and even tingling sensations on the tongue. Researchers say the deficiency may also interfere with nerve function and the protective coating surrounding nerves inside the mouth, contributing to burning or stinging sensations long before more obvious symptoms appear.
In some cases, people may develop recurring mouth ulcers, smooth “bald” tongues or cracking at the corners of the lips that continues returning despite topical treatments.
Experts say these symptoms should not automatically be dismissed as normal aging or simple irritation. Vitamin B12 deficiency becomes increasingly common with age, particularly among older adults, people with digestive issues and those taking medications that interfere with nutrient absorption. While blood testing can help confirm deficiency, researchers note that symptoms and underlying absorption problems often deserve just as much attention as lab numbers alone.
Supporting healthy B12 levels through nutrient-dense foods and proper absorption may play an important role in maintaining energy, nerve health and healthy tissue repair throughout the body.
SOURCE:
Health, May 19, 2026