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Without intrinsic factor, people develop vitamin B12 deficiency, with symptoms such as fatigue, a distinctive change in red blood cells, nausea, indigestion and other digestive problems, weakness, headaches and weight loss

Katie, who is in her 30s, had extreme fatigue, heart palpitations, chest pain and brain fog

If you're taking antibiotics such as chloramphenicol, colchicine, folic acid, methotrexate, and para-aminosalicylic acid, your doctor may have to monitor your condition for any possible side effects

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