September 2026

Iron Deficiency in Women: Why It's So Common and Easy to Miss

Tired all the time, a bit breathless walking up stairs, cold hands that never quite warm up, it's easy to file all of this under "just busy" or "just getting older" and move on. For a huge number of women, the actual explanation is far more straightforward and far more fixable: iron deficiency, one of the most common nutrient shortfalls there is, and one that's routinely missed for years before it's finally picked up on a blood test.

Why women specifically are so affected

Menstruation is the single biggest reason iron deficiency shows up so much more often in women than men , regular monthly blood loss creates an ongoing iron requirement that simply doesn't exist for most men. Heavier periods increase this further, and conditions that cause heavier or more frequent bleeding compound the effect considerably. Pregnancy and breastfeeding increase iron requirements substantially too, to support the growing demands of a developing baby and increased blood volume, meaning many women enter or move through these life stages already running a deficit that then widens further. On top of the biological demand, many women also don't eat quite enough iron-rich food to offset what's being lost each month, particularly if red meat intake is low or diets skew toward foods with lower iron content.

Why the symptoms get missed so often

Iron deficiency symptoms are notoriously vague and easy to attribute to something else, persistent fatigue, reduced exercise tolerance, feeling cold more than usual, brittle nails, hair thinning, difficulty concentrating, and pale skin are all common signs, but every one of them overlaps heavily with stress, poor sleep, or simply being busy. Because none of these symptoms are dramatic or specific on their own, iron deficiency is frequently attributed to lifestyle factors for months or years before anyone thinks to test for it specifically.

The difference between low iron and anaemia

Iron deficiency exists on a spectrum. Early on, iron stores (measured as ferritin) can be low while red blood cell counts still look normal on a standard blood test, meaning symptoms can genuinely be present before the more commonly known marker, haemoglobin, drops enough to be flagged as anaemia. This is part of why a standard blood test can sometimes come back "normal" even when someone is experiencing real, iron-related symptoms, a specific ferritin test is often needed to see the full picture.

What actually helps

Getting properly tested is the necessary first step, since iron deficiency isn't something to self-diagnose or self-treat based on symptoms alone, a simple blood test through your GP, including ferritin specifically, gives a clear answer rather than guesswork. Dietary iron comes in two forms, with the kind found in red meat, poultry, and fish absorbed considerably more efficiently by the body than the kind found in plant sources like lentils, spinach, and fortified cereals, which is worth knowing particularly for anyone eating a largely plant-based diet.

Pairing plant-based iron sources with vitamin C, citrus, capsicum, tomato, meaningfully improves absorption, while tea and coffee consumed around mealtimes can reduce iron absorption, so spacing them away from iron-rich meals is a simple, practical adjustment. For anyone confirmed as deficient through testing, supplementation is often necessary alongside diet, since correcting a genuine deficit through food alone can be a slow process, and a doctor can advise on the right form and dose for your specific situation.

When to see a doctor

If you're experiencing persistent fatigue, breathlessness, unusual paleness, or other symptoms that don't resolve with rest and time, it's worth requesting a full iron study, including ferritin, from your GP rather than assuming it's simply tiredness. This is particularly relevant if you have heavy periods, are pregnant, or follow a largely plant-based diet, all of which increase the likelihood of a genuine deficiency.

The final note

Iron deficiency is extremely common in women and routinely hides behind symptoms that get blamed on everything except iron, fatigue, low mood, poor concentration. A simple, specific blood test is the only reliable way to know where you actually stand, and correcting a genuine deficiency tends to make a noticeable difference once addressed properly.

This article is general health information only and is not medical advice, and does not diagnose, treat, cure or prevent any disease. Speak with your doctor about testing your iron levels.