What does low ferritin mean?

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Ferritin is your iron savings account - the protein that stores iron in reserve - and a low ferritin means the reserves are running out, even when the everyday iron measures still look fine. That is its clinical value: MedlinePlus notes ferritin drops first, before hemoglobin falls, so low ferritin catches iron deficiency in its earliest stage. The symptoms cluster accordingly: fatigue and low stamina, breathlessness on exertion, pale skin, cold hands, brittle nails, hair shedding, restless legs at night, and in some people, ice cravings - pica - which is oddly specific to iron deficiency.

Why stores drain: menstrual blood loss is the most common cause in women - heavy periods can outrun dietary iron every month; pregnancy drains stores building the baby; low dietary intake, especially without meat; poor absorption from celiac disease or stomach acid suppression; and slow hidden bleeding from the gut - which is why low ferritin in men and postmenopausal women earns a look for a bleeding source rather than a supplement alone.

The fix: iron supplements with vitamin C, away from tea, coffee, and calcium, per NHLBI - plus iron-rich food - and rechecking ferritin after two to three months, since stores refill slowly and the goal is rebuilding them rather than only normalizing hemoglobin. Finding and fixing the source of the drain matters as much as the supplement.

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