3. Mouth Sores or Cracks at the Corners of Your Lips
Sore, red patches inside your mouth or small cracks at the corners of your lips can feel irritating and persistent. These areas might burn slightly or make eating uncomfortable.
Observations in health literature point to oral discomfort as another way low B12 can show up. The tongue may also appear smoother or redder than usual. These changes can develop slowly, making them easy to attribute to dry weather, spicy food, or stress instead.
