You slept eight hours. You still feel like you waded through treacle to reach lunchtime. If your energy has quietly thinned out and you keep blaming a busy life, your iron levels are worth a gentle look.
⏱️ 8-minute read · Words by Chiara Ugozzoli · Updated June 2026
TLDR: Iron helps your blood carry oxygen, so when it runs low you feel tired, foggy, and short of puff. Heavy periods make women especially prone to it. Iron-rich food, a vitamin C boost, and a simple blood test when symptoms linger all help you take charge.
Why does low iron leave you so wiped out?
Picture your bloodstream as a fleet of tiny delivery vans carrying oxygen to every corner of you. Iron is the part that lets each van hold its cargo. Your body uses iron to make haemoglobin, the protein in red blood cells that carries oxygen from your lungs to the rest of your body, as the NIH Office of Dietary Supplements (ODS) explains in its iron fact sheet. When iron stores dip, the vans carry less oxygen, and tissues that run on oxygen, which is all of them, start to feel the pinch. That is the deep, dragging tiredness you recognise.
When stores stay low for a while, iron-deficiency anaemia sets in. The ODS describes how red blood cells become smaller and contain less haemoglobin, so the blood carries less oxygen around the body. Common symptoms include weakness, tiredness, lack of energy, and trouble with concentration and memory. That last one explains the mental fog as much as the physical droop, the sense that your brain is buffering.
The UK’s NHS guide to iron deficiency anaemia echoes this picture, listing tiredness and lack of energy, shortness of breath, noticeable heartbeats (palpitations), paler than usual skin, and headaches among the symptoms. So if stairs leave you puffing more than they used to, or your heart seems to announce itself when you climb them, that is part of the same story.
What are the quieter signs worth noticing?
Beyond the headline tiredness, low iron has a cast of smaller, stranger signs that are easy to dismiss one at a time. The NHS lists several of the less common ones: a ringing, buzzing, or hissing sound inside your head (tinnitus), food tasting odd, an itchy feeling, a sore tongue, hair loss you notice when brushing or washing, painful sores in the corners of your mouth, brittle or spoon-shaped nails, and restless legs syndrome.
One of the most curious signs is called pica: a craving to eat things that sit outside food entirely, such as ice or paper. Many women feel a flicker of relief when they read that, because a habit they found embarrassing turns out to be a recognised clue, a real signal worth respecting. If a few of these ring true alongside the fatigue, they are worth mentioning together, since the pattern tells a doctor more than any single symptom alone.
Picture this. It is a Tuesday in March. You make it through the workday on caffeine and willpower, you skip the gym because your legs feel like sandbags, and you find yourself crunching ice at your desk for a reason you struggle to name. You assume it is just February’s long shadow hanging on. Then a friend mentions she felt exactly the same, got a blood test, and discovered her iron was low. That small conversation is often the turning point, the moment vague exhaustion becomes a question with an answer.
Why are women so prone to running low?
Here is the bit that makes iron such a women’s-health staple. The NHS states plainly that heavy periods and pregnancy are very common causes of iron-deficiency anaemia. Every period sheds blood, and blood holds iron, so monthly losses add up. When periods are heavy, the maths tips further, and the NHS notes that heavy periods can be treated with medicine, which is a useful door to keep in mind.
The ODS spells out who tends to fall short, naming teen girls and women with heavy periods, pregnant women and teens, frequent blood donors, and people with certain gut conditions among the groups more likely to have trouble getting enough iron. The requirements themselves tell the tale: the ODS lists the recommended daily amount as 18 milligrams (mg) for adult women aged 19 to 50, compared with just 8 mg for adult men in the same age band, and a notably high 27 mg during pregnancy. Women simply need more, and life keeps drawing on the account.
There is one more wrinkle worth flagging. The ODS points out that people following a mostly plant-based diet need almost twice as much iron, because the body absorbs the nonheme iron in plant foods less efficiently than the heme iron in animal foods. If you eat little or scant meat, that is useful context to hold, and the next section shows how to work with it.
Can food really move the needle?
For many women, food is a genuinely powerful lever, and the good news is that iron lives in plenty of everyday, delicious places. The ODS lists lean meat, seafood, and poultry; iron-fortified breakfast cereals and breads; white beans, lentils, spinach, kidney beans, and peas; and nuts and some dried fruits such as raisins. The NHS adds dark-green leafy vegetables like watercress and curly kale, dried fruit such as apricots and prunes, and pulses to the same picture.
The clever trick is absorption. The ODS notes that your body takes up iron from plant sources better when you pair it with vitamin C, found in citrus fruits, strawberries, sweet peppers, tomatoes, and broccoli. So a squeeze of lemon over your lentils, peppers tossed through a spinach salad, or a glass of orange juice with a fortified breakfast quietly doubles as an absorption hack.
A few things compete for that same iron, and timing them apart helps. The NHS suggests going easier on tea, coffee, milk and dairy, and high-phytic-acid foods like wholegrain cereals around your iron-rich meals, since large amounts make iron harder to absorb. You get to keep your beloved cup of tea; simply enjoy it between meals, away from your iron-rich plate.
Try this tonight: Build one “iron-friendly” plate. Cook a simple lentil or bean dish, stir through a big handful of spinach until it wilts, and finish with a squeeze of lemon or a side of sliced peppers for the vitamin C lift. Save your tea or coffee for an hour or two afterwards. It is one easy, genuinely tasty meal, and it shows you how painless eating for your iron can be.
When should I actually get a test?
Food does a lot, and at the same time some situations call for a professional. The NHS advice is refreshingly simple: see a GP if you think you might have iron-deficiency anaemia. You arrive just as you are, and the GP will usually arrange a blood test called a full blood count (FBC), which checks whether your red blood cell count sits in the normal range and also looks for other types of anaemia, such as vitamin B12 or folate deficiency.
If a low result turns up, the NHS explains that the GP works out the reason, for example heavy periods, and recommends treatment. That often means iron tablets to replace what is missing, typically taken for around six months, and the NHS adds a charming tip that drinking orange juice after a tablet may help your body absorb the iron. Some people get side effects such as constipation, tummy pain, or darker stools, and taking the tablets with or soon after food can ease that. Worth keeping firmly in mind: the NHS flags that iron supplements must stay out of the reach of children, because an overdose in a young child can be fatal.
One honest caveat keeps all of this safe. Iron supplements suit people who genuinely need them, so the sensible path is to get tested first, ahead of starting high-dose tablets on a hunch. The ODS warns that too much iron causes its own problems, from upset stomach to more serious effects, which is exactly why a quick test first protects you. Speak with your doctor or pharmacist before adding a supplement, and let the blood test guide the dose.
The gentle takeaway
Persistent tiredness deserves curiosity, the gentle and genuine kind. Iron lets your blood ferry oxygen, women lose iron through periods and pregnancy, and a low tank shows up as fatigue, fog, breathlessness, and a few quirky signs like ice cravings. You can support your levels with iron-rich food paired with a vitamin C boost, and you can settle the question for good with a simple blood test when symptoms linger. Listen to the dragging days, gather your clues, and let a doctor help you read them. Feeling like yourself again is often closer than it seems.
PrettyWell is a women’s lifestyle and wellbeing magazine. This article shares general information and wellbeing perspectives to help you ask better questions and feel more in charge; for anything about your own health, please speak with a qualified healthcare professional.
References
- NIH Office of Dietary Supplements. Iron: Fact Sheet for Consumers. https://ods.od.nih.gov/factsheets/Iron-Consumer/
- NHS. Iron deficiency anaemia. https://www.nhs.uk/conditions/iron-deficiency-anaemia/
