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Understanding Anaemia — A Complete Guide
Anaemia — defined clinically as a haemoglobin concentration below the normal threshold for age, sex, and physiological state — is not a diagnosis but a laboratory finding that signals an underlying problem. Approximately 2 billion people worldwide have anaemia, making it the most prevalent nutritional disorder on earth. Yet it remains significantly underdiagnosed, partly because mild anaemia is often asymptomatic and partly because its cardinal symptom — fatigue — is so non-specific that both patients and clinicians frequently attribute it to overwork, poor sleep, or stress without investigating further. The consequences of untreated anaemia extend well beyond tiredness: it impairs cognitive function, exercise capacity, immune competence, and quality of life, and in pregnancy it significantly increases maternal and perinatal mortality.
Iron Deficiency — The World's Most Common Nutritional Deficiency
Iron deficiency affects approximately 1 billion people worldwide and is responsible for roughly half of all anaemia cases. The pathophysiology is straightforward: when iron stores become depleted, the bone marrow cannot synthesise adequate haemoglobin, and the resulting red blood cells are smaller (microcytic) and contain less haemoglobin (hypochromic). The most sensitive diagnostic test is serum ferritin — a protein that reflects iron stores. Ferritin falls before haemoglobin drops, meaning iron-deficient patients can have normal haemoglobin but already-depleted stores and early symptoms. This latent iron deficiency stage is extremely common but frequently missed on a standard FBC alone. Common causes include heavy menstrual bleeding (the leading cause in premenopausal women), coeliac disease and other malabsorption conditions, gastrointestinal blood loss from peptic ulcers, colorectal cancer, or non-steroidal anti-inflammatory drug use, and inadequate dietary intake — particularly in vegetarians and vegans who rely exclusively on less-bioavailable non-haem iron.
Vitamin B12 Deficiency — The Silent Neurological Emergency
B12 deficiency is the most frequently missed cause of anaemia in developed countries, particularly in older adults. The neurological consequences of B12 deficiency — subacute combined degeneration of the spinal cord, causing tingling, numbness, weakness, and eventually paralysis — are largely irreversible once established. This distinguishes B12 deficiency from iron and folate deficiency in terms of urgency: a prolonged untreated deficiency can cause permanent disability even after the anaemia is treated. The insidious aspect is that neurological symptoms can precede blood abnormalities by months — a patient may have a normal haemoglobin but active, progressive neurological damage from B12 deficiency. Causes include pernicious anaemia (autoimmune destruction of gastric parietal cells that produce intrinsic factor, required for B12 absorption), long-term use of metformin or proton pump inhibitors, strict plant-based diets without B12 supplementation, and any cause of terminal ileum disease or resection. A serum B12 below 200 pg/mL, combined with elevated methylmalonic acid (MMA), is diagnostic.
Anaemia Supplements at Enavec Pharmacy
Ferrous sulphate, ferrous bisglycinate, iron + vitamin C combinations, vitamin B12 (methylcobalamin), methylfolate, vitamin C for iron absorption, haematinics, and expert pharmacist guidance on choosing the right anaemia supplement for your type.
Haemolytic Anaemia — When Red Cells Are Destroyed Too Quickly
Haemolytic anaemias are a diverse group of conditions united by one mechanism: red blood cells are destroyed (lysed) faster than the bone marrow can replace them. The resulting anaemia is characterised by jaundice, dark urine, an elevated reticulocyte count (reflecting the marrow's compensatory effort), and elevated bilirubin and LDH. Inherited haemolytic anaemias include sickle cell disease — the most prevalent inherited blood disorder globally, carried by 300 million people worldwide — thalassaemia syndromes, hereditary spherocytosis, and G6PD deficiency (the most common enzyme defect in humans, affecting 400 million people). Acquired haemolytic anaemias include autoimmune haemolytic anaemia (AIHA), microangiopathic haemolytic anaemia, and drug-induced haemolysis. G6PD deficiency deserves particular attention: it affects approximately 8% of the global male population and is triggered by oxidative stress from certain drugs (primaquine, dapsone, rasburicase), foods (fava beans), and infections, causing acute haemolytic episodes that can be severe. Many affected individuals are unaware they carry the condition.
Folate Deficiency — Critical in Pregnancy
Folate (vitamin B9) is essential for DNA synthesis and red blood cell production. Deficiency produces the same megaloblastic blood picture as B12 deficiency — large, immature red blood cells — but without the neurological complications. The distinction matters clinically: giving folate to a B12-deficient patient may partially correct the blood count while allowing the neurological damage to progress silently. In pregnancy, folate deficiency in the first trimester dramatically increases the risk of neural tube defects (spina bifida, anencephaly). Supplementation with 400mcg folic acid daily before conception and through the first trimester reduces neural tube defect risk by approximately 70%. Women planning pregnancy or who are pregnant should supplement with folic acid regardless of dietary intake. Folate is abundant in dark leafy vegetables, legumes, and fortified grains — but cooking destroys up to 90% of food folate, making supplementation the most reliable strategy.