02/20/2026
3 Reasons Hashimoto’s & B12 Deficiency Often Overlap
• Digestion struggles
Hashimoto’s can slow digestion and lower stomach acid, making it harder to break down food and absorb nutrients like B12. This can show up as bloating, heartburn, or that heavy-after-eating feeling.
• Autoimmune connections
Hashimoto’s often travels with other autoimmune conditions, including pernicious anemia. In this case, the body can’t properly absorb B12 because it attacks the stomach cells needed for absorption.
• Gut infections
Bacteria like H. pylori can damage the stomach lining and interfere with B12 absorption. Over time, this can increase the risk of deficiency and anemia.
If you have Hashimoto’s and feel tired, foggy, or low on energy, B12 is always worth a closer look. Supporting digestion and gut health can make a big difference.