Iron Deficiency Is More Common Than You Think, Especially in Women

H Pavel Volkov · howtolive.guide · 20 April 2026

Fatigue, brain fog, cold hands, hair loss, brittle nails — these vague symptoms are often dismissed as stress, but they're classic signs of iron deficiency, the world's most common nutritional deficiency. Women of reproductive age, vegetarians, and frequent blood donors are especially at risk. A blood test can show it: low ferritin means depleted iron stores, but a normal or high ferritin does not always rule deficiency out, because inflammation raises it, so the doctor reads it together with other results. Don't self-supplement with high-dose iron — too much is also harmful. Get tested first, then work with your doctor on the right dose and form. If low iron is confirmed, the doctor will also look for why it is low. More on reading results: how to read a blood test.

The point

Iron deficiency is common and can cause tiredness and brain fog, but so can many other things — a blood test read by your doctor, not a guess or a supplement, shows whether low iron is part of the picture.

Iron Deficiency Is More Common Than You Think, Especially in Women

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