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There are many B12 deficiency signs and symptoms, including: Numbness Tingling, pins and needles Weakness, dizziness High homocysteine, low methionine Megaloblastic macrocytic anaemia Mild or moderate leukopenia (low white blood cells) Mild or moderate thrombocytopenia (low platelets) Enlarged red blood cells (macrocytosis) Abnormal white cell (neutrophils) Chronic fatigue or tiredness General weakness or lethargy General Signs and Symptoms: Ataxia, (unsteady walking) Paresthesia (prickling sensation) and weakness in peripheral nerves Confusion Infertility Vision loss Leg pains Shortness of breath Loss of appetite/weight loss Epigastric pain Osteoporosis Increased susceptibility to infection Failure to thrive in infants Vitiligo Premature greying of hair Burning feet Mental Changes Depression (including postpartum depression) Irritability Apathy Psychosis Sleepiness Suspiciousness (paranoia) Personality changes Memory loss Dementia, intellectual deterioration Hallucinations Violent behaviour Developmental delay and/or autistic behaviour in children Neurological signs and symptoms Abnormal sensations ie: pain, tingling, numbness of legs, arms, trunk A diminished sense of touch, pain and/or temperature Loss of position sense (awareness of body position) Weakness of limbs Clumsiness Tremor Symptoms mimicking Parkinsons disease or MS Spasticity of muscles Incontinence (urine or stool) Paralysis Vision changes Damage to the optic nerve neuritis, inflammation, atrophy Vascular Problems Transient ischemic attacks (TIAs) Cerebral vascular accident Coronary artery disease Myocardial infarction Congestive heart failure Palpitations Orthostatic hypotension Deep vein thrombosis Pulmonary embolism 7 Why is B12 deficiency often underdiagnosed
Always consult a qualified medical practitioner
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Key lookup pathways: Main term Diabetes, diabetic: Sub-terms include Type 1, Type 2, due to underlying condition, drug-induced, gestational. Under each type, sub-sub-terms list every complication e.g., with / kidney complications / chronic kidney disease. With convention in the Index: Sub-terms listed under with in the diabetes entry do NOT require explicit provider linkage
Oegroseno et al., 2016
