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By Matthew Solan Executive Editor, Harvard Men's Health Watch image: Celso Pupo Rodrigues | Dreamstime.com

People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms

Issues like dehydration, poor gut bacteria (dysbiosis), or damage to the mouth, stomach, or small intestine can affect B12 absorption and how it moves throughout the body

Ulcerative colitis (K51.x) is one of the most critical distinctions in gastroenterology coding