The NHS also lists a “sore and red tongue,” known as glossitis, as a symptom alongside mouth ulcers. “Vitamin B12 deficiency can cause physical, neurological and psychological symptoms,” the Cleveland ...

The Cleveland Clinic points out that a physical indicator of B12 deficiency is a "sore" mouth and tongue. The NHS also cites a "sore and red tongue," or glossitis, and mouth ulcers as symptoms.

The NHS also cites a "sore and red tongue," or glossitis, and mouth ulcers as symptoms. "Vitamin B12 deficiency can cause physical, neurological and psychological symptoms," explains the Cleveland ...