Many diseases and medical conditions can either cause or have roots in vitamin B-12 deficiency.  Many of these issues relate to an inability to properly absorb vitamin B12 in the gut (which is a surprisingly complex three stage process).  Here’s a quick list:

• Chronic fatigue syndrome.
• Fibromyalgia.
• Autoimmune diseases.
• Poor nutrition.
• Smoking.
• Alcoholism.
• High stress.
• Stomach or ileum resectioning.
• Gastric bypass surgery.
• Stomach surgery.
• Gastrointestinal mucosa atrophy.
• Crohn’s disease.
• Diabetes.
• Rheumatoid arthritis.
• Hypothyroidism.
• Anorexia.
• Bulemia.

Related posts:

1. Medical Conditions Linked With B-12 Deficiency Risks
2. Weight Loss Surgery & Vitamin B-12 Deficiency