Iron deficiency symptoms in women:
12 signs to check.
Iron deficiency symptoms in women often start quietly: tiredness that sleep doesn’t fix, getting breathless on the stairs, hair coming out in the comb, cold hands, or a craving to chew ice. Iron carries oxygen to every cell, and most women in India lose more iron each month than their food replaces. Here are the 12 signs to check, why they happen, which blood tests confirm low iron, and what to do next.
This guide is for education. Chest pain, fainting, very heavy bleeding or black stools need a doctor straight away.
Iron deficiency symptoms in women: the short version
What are the signs of low iron in women?
The most common signs of low iron in women are tiredness that rest doesn’t fix, pale skin and inner eyelids, getting breathless or a racing heart on stairs, headaches, cold hands and feet, hair shedding, brittle nails, a sore tongue, restless legs at night, craving ice or clay, and poor focus.
Iron contributes to the normal formation of red blood cells and haemoglobin, normal oxygen transport, normal energy-yielding metabolism, normal cognitive function, normal immune function and the reduction of tiredness and fatigue.1 So when iron runs low, the first things you notice are energy, breath, focus and the parts of the body that renew fast: hair, nails, skin and tongue.
Low iron happens in stages. First your iron stores (ferritin) drain, then iron for new cells runs short, and only last does haemoglobin fall into anaemia. Many symptoms, especially tiredness, hair shedding, restless legs and cravings, can start in the early stages, while a basic haemoglobin test still looks normal.2,3
12 signs of low iron in women
What are the 12 signs of iron deficiency?
The 12 signs are: constant tiredness, pale skin, breathlessness, a fast heartbeat, headaches or dizziness, cold hands and feet, hair shedding, brittle or spoon-shaped nails, a sore smooth tongue or cracked mouth corners, restless legs, cravings for ice, clay or chalk, and poor focus or brain fog.
| Sign | What you may notice | Why low iron causes it |
|---|---|---|
| 1. Tiredness | Tired all day, even after a full night’s sleep | Less oxygen and less energy production in muscles and brain |
| 2. Pale skin | Pale face, pale inner eyelids, pale nail beds | Less haemoglobin, the red pigment in blood |
| 3. Breathlessness | Out of breath on stairs or a short walk | Blood carries less oxygen per breath |
| 4. Fast heartbeat | Pounding or racing heart with small effort | The heart pumps faster to move more oxygen |
| 5. Headaches and dizziness | Headaches, light-headed when you stand up | Less oxygen reaching the brain |
| 6. Cold hands and feet | Always cold when others are comfortable | Lower heat production and changes in thyroid hormone activity |
| 7. Hair shedding | More hair in the comb, on the pillow or in the drain | Hair roots divide fast and need iron |
| 8. Brittle or spoon nails | Thin nails that split, or nails that curve up like a spoon | Nail cells grow fast and need iron and good blood flow |
| 9. Sore tongue, cracked lips | Smooth, red, sore tongue; cracks at mouth corners | Mouth lining renews fast and needs iron |
| 10. Restless legs | An urge to move your legs in the evening or in bed | Iron is needed for dopamine signalling in the brain |
| 11. Unusual cravings (pica) | Craving ice, mitti (clay), chalk or raw rice | Linked to low iron; eases once iron is restored |
| 12. Poor focus | Brain fog, slow thinking, irritability | Iron supports normal cognitive function |
1. Tiredness that sleep doesn’t fix
The most common sign. Iron sits at the centre of haemoglobin and the enzymes that make energy in every cell. In a trial of 198 women with unexplained tiredness and low iron stores but normal haemoglobin, taking iron for 12 weeks reduced fatigue by 47.7%, against 28.8% on placebo.4 A review of 18 trials in people with low iron but no anaemia found that iron reduced self-reported fatigue.5
2. Pale skin, inner eyelids and nail beds
Haemoglobin gives blood its red colour. With less of it, the face, the inside of the lower eyelids, the gums and the nail beds look paler than usual.6 Pull down your lower eyelid in daylight: a pale pink rather than red inner lid is worth a blood test.
3. Breathless on stairs or a short walk
Less haemoglobin means each breath carries less oxygen, so ordinary effort feels harder.6 In a review of 22 trials in women of reproductive age, iron improved maximal exercise capacity (VO2max) and made the same workload feel easier on the body.7
4. A fast or pounding heartbeat
When blood carries less oxygen, the heart beats faster to make up for it. In the same review, iron lowered heart rate during moderate exercise by about 4 beats a minute.7 A racing heart with chest pain or fainting is an emergency.
5. Headaches, dizziness and feeling light-headed
Less oxygen reaching the brain can bring headaches and light-headedness, especially when you stand up quickly or skip meals.6 Headaches are among the classic signs doctors list for low iron.
6. Cold hands and feet
Research links low iron with poorer control of body temperature: the body makes less heat, partly through changes in thyroid hormone activity, and holds back blood flow to the skin to protect oxygen supply.8 Our always cold guide covers iron and thyroid together.
7. Hair shedding
Hair roots are some of the fastest-dividing cells in the body. A review of 36 studies with over 10,000 women found that women with non-scarring hair loss had lower ferritin than women without hair loss, and the gap was clearest before menopause.9 Ask for ferritin alongside thyroid tests. See our hair fall guide.
8. Brittle or spoon-shaped nails
Thin nails that split easily are common with low iron.6 Long-standing low iron can make nails curve up at the edges like a spoon (koilonychia), a sign doctors say should always prompt an iron check.10 Read more in our weak nails guide.
9. A sore, smooth tongue or cracked mouth corners
The lining of the mouth renews every few days and needs iron to do it. Low iron can leave the tongue smooth, red and sore, and cause cracks at the corners of the mouth.6 Low vitamin B2 and B12 cause the same signs, so testing matters.
10. Restless legs at night
Restless legs is an uncomfortable urge to move your legs in the evening or in bed. Iron is needed for dopamine signalling in the brain, and a Cochrane review of 10 trials found that iron improved restless legs severity, with moderate-certainty evidence.11 It is common in pregnancy and with heavy periods.
11. Craving ice, mitti, chalk or raw rice
Craving things that aren’t food is called pica; craving ice is called pagophagia. In a study of 262 adults with low iron, 45% had pica, and most of them craved ice. In every one of them the craving eased within three weeks of iron treatment.12 In India, craving mitti (clay), chalk or raw rice is the same signal.
12. Poor focus, brain fog and irritability
Iron supports normal cognitive function.1 In a 16-week trial in women aged 18–35, women with low iron were less accurate and slower on thinking tasks than women with enough iron, and as ferritin rose with iron treatment, performance improved.13 See our brain fog guide for the other nutrients involved.
Claims are ingredient-based and not specific to any product. Details of each study are in the “About the studies” box at the bottom of this page.
“Your iron stores empty long before your haemoglobin falls. The body notices first; the basic blood test notices last.”
The simple version
Low iron symptoms with normal haemoglobin
Can you have low iron symptoms with normal haemoglobin?
Yes. Iron stores can run low long before haemoglobin falls, and tiredness, hair shedding, restless legs and cravings can start at this stage. In a large US study, 84% of young women with low iron stores had normal haemoglobin. A ferritin test shows the stores.
This stage is called iron deficiency without anaemia. In a study of 3,490 young women in the United States, 38.6% had low iron stores, but only 6.3% were anaemic: 84% of those with low iron would have been missed by a haemoglobin test alone.2 In Uttar Pradesh, a survey that measured ferritin found 51% of women of reproductive age were iron deficient.14
That is why the trials of tiredness above matter: the women who felt better on iron were not anaemic.4,5 If you have the signs, ask for ferritin, not just haemoglobin.
The symptoms of anaemia in women are the same 12 signs, usually stronger: once haemoglobin falls, breathlessness, a racing heart, pale skin and dizziness become more noticeable, because the blood itself carries less oxygen.6
Why women in India run low on iron
Why are so many Indian women low in iron?
Indian women lose iron every month through periods, need much more in pregnancy, and mostly eat vegetarian, cereal-based meals from which only about 8% of iron is absorbed. Tea with meals cuts absorption further. That is why India’s iron need for women is 29 mg a day, against 19 mg for men.
- Monthly periods: women lose on average about 13.7 mg of iron in each 28-day cycle, and much more with heavy periods.14
- Vegetarian, cereal-based meals: about 70% of the iron Indians eat comes from cereals and only about 1% from heme iron in meat and fish, so only about 8% is absorbed.14
- Tea and coffee with meals: their polyphenols reduce the iron you absorb from food. Vitamin C does the opposite and helps absorb it.15
- Pregnancy and breastfeeding: a pregnancy needs about 425–475 mg of extra iron in total.14
- Other causes: stomach or bowel conditions such as coeliac disease, past stomach surgery, frequent blood donation, and some medicines.6
The result: 57% of Indian women aged 15–49 are anaemic, as are 52.2% of pregnant women and 59.1% of girls aged 15–19.16 Not every anaemia is from iron, which is why testing matters.
Which blood tests confirm low iron?
Which test shows iron deficiency?
Ferritin is the best single test for iron stores. Ask for ferritin with a complete blood count (haemoglobin and red-cell size). In 2026, haematologists set ferritin of 30 ng/mL or lower as a sign of iron deficiency in women, and 50 or lower with heavy periods. Infection can hide low iron, so add CRP.
| Test | What it shows | Points to low iron |
|---|---|---|
| Ferritin | Your iron stores | 30 ng/mL or lower; 50 or lower with heavy periods, symptoms or pregnancy plans (ASH 2026) |
| Haemoglobin | Oxygen-carrying protein in blood | Under 12.0 g/dL means anaemia in women (WHO 2024); under 11.0 in the first and third trimesters, under 10.5 in the second |
| MCV and MCH (in a CBC) | Size and colour of red cells | Small, pale red cells; large cells point to B12 or folate instead |
| Transferrin saturation | How much iron is in transit | Under 20%, useful when infection or inflammation is present |
| CRP | Inflammation | If raised, ferritin can look normal even when iron is low (WHO: under 70 ng/mL may still mean deficiency) |
The American Society of Hematology raised its ferritin cut-off in 2026 from 15 to 30 ng/mL for menstruating women and pregnancy, because the old cut-off missed many women with low iron.3 Haemoglobin cut-offs come from WHO’s 2024 guideline,17 and WHO advises reading ferritin together with inflammation markers.18 If tests show anaemia with large red cells, read our vitamin B12 deficiency guide.
How much iron do women need a day?
How much iron does a woman need daily?
India’s daily iron need for women is 29 mg from 18 years to menopause, about 27 mg in pregnancy, 23 mg while breastfeeding and 19 mg from age 60. Men need 19 mg. These amounts are from food and supplements together; the safe upper limit is 45 mg a day.
| Life stage | Iron a day | Why |
|---|---|---|
| Women, 18 to menopause | 29 mg | Covers monthly period losses for nearly all women |
| Pregnancy | about 27 mg | Baby, placenta and a larger blood volume |
| Breastfeeding | 23 mg | Iron in breast milk; periods usually paused |
| Women 60 and over | 19 mg | No more period losses |
| Men (for comparison) | 19 mg | Only daily basal losses |
The upper limit for iron is 45 mg a day from all sources.14 Under India’s supplement rules, a daily serving of a health supplement can provide up to one full RDA.14 Higher doses used to treat anaemia are prescribed by doctors.
What to do if you notice the signs
What should I do if I think my iron is low?
Get a ferritin test and complete blood count first, rather than guessing. Eat iron-rich foods with vitamin C, keep tea and coffee an hour away from meals, take iron only as your doctor advises, and find the cause, such as heavy periods. Recheck your blood after about three months.
- Test before you treatAsk your doctor for ferritin, a complete blood count and CRP. Tiredness has many causes, including thyroid, B12 and vitamin D.
- Eat iron-rich foods every dayRajma, chana, lentils, soya, ragi, bajra, garden cress seeds (halim), green leafy vegetables, and eggs, fish or meat if you eat them.
- Add vitamin C to iron mealsLemon, amla, guava, tomato or orange with your meal helps you absorb plant iron.
- Keep tea and coffee away from mealsHave chai at least an hour before or after an iron-rich meal or an iron tablet.
- Take iron only as advisedFollow your doctor’s dose and timing; keep calcium, antacids and thyroid tablets apart from iron.
- Find the causeHeavy periods, pregnancy plans, stomach problems or blood donation all change what you need.
- Recheck in about three monthsFerritin and haemoglobin show whether your stores are refilling.
Iron stores refill slowly, which is why doctors recheck blood after a few months rather than a few days. If your tiredness has more than one cause, our fatigue blood tests guide lists what doctors check, and our guide to who needs iron explains why a blood test should decide.
You have chest pain, fainting or severe breathlessness, very heavy periods (soaking a pad every hour or passing large clots), black or bloody stools, vomiting blood, or low iron after menopause, which always needs the cause found. Keep iron tablets out of reach of children: an iron overdose is dangerous for a child. People with haemochromatosis or iron overload must not take iron.
Test first, then fill the real gaps.
Low iron is confirmed with a blood test and corrected with food and your doctor’s advice. Tiredness rarely has only one cause, so we help you find your other nutrient gaps too.
Nutrient Gap Finder
Answer a few quick questions about your food, periods, routine and symptoms to see which nutrients you may be running low on, including iron, and which tests to ask your doctor about.
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Launching first. 100% non-buffered magnesium glycinate: 440 mg of magnesium from 3,667 mg of fully reacted bisglycinate, with about 2.7 g of glycine and zero oxide. Magnesium contributes to the reduction of tiredness and fatigue and to normal energy-yielding metabolism. Take it in the evening, away from iron.
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Join the waitlist →- The tiredness trial gave 80 mg of iron a day for 12 weeks to 198 menstruating women with ferritin under 50 µg/L; tiredness also fell in the placebo group.4
- The 18-trial review rated the fatigue result as moderate certainty; most participants were healthy women and follow-up was short. Iron did not clearly improve objective fitness tests in people who were not anaemic.5
- The exercise review included 22 trials of different iron doses; only 3 were at low risk of bias.7
- The hair-loss review compared ferritin in women with and without hair loss; it did not test iron supplements, and most studies came from specialist clinics.9
- In the restless legs review, not everyone had low iron at the start; several trials gave iron by injection.11
- In the pica study, iron was given by injection (intravenous iron dextran) in a US clinic.12
- The thinking-skills trial had 149 women at the start and 113 at 16 weeks.13
- The 84% figure comes from US young women aged 12–21 using ferritin under 25 µg/L; the Uttar Pradesh figure used inflammation-adjusted ferritin.2,14
- Cold hands and feet are linked to low iron mainly through physiology studies and reviews rather than large trials.8
- The 2026 ferritin cut-offs are conditional recommendations based mostly on low-certainty evidence, and are a guide for doctors, not an automatic trigger to take iron.3
Low iron in women, answered simply.
What are the first signs of low iron in women?
What are the 12 signs of iron deficiency?
How do I know if I need iron?
Can low iron cause hair loss?
What ferritin level is too low for a woman?
Can I have low iron if my haemoglobin is normal?
What is a normal haemoglobin level for women?
Does low iron make you tired all the time?
Why do I crave ice or mitti?
Can low iron cause restless legs?
Can low iron cause a fast heartbeat or breathlessness?
Can low iron make you feel cold?
Can low iron affect focus and mood?
What do iron deficiency nails look like?
Why are so many Indian women low in iron?
How much iron does a woman need a day?
Which foods are high in iron for vegetarians?
Does tea stop iron absorption?
How long does it take to feel better after low iron is corrected?
Can heavy periods cause iron deficiency?
Is it safe to take iron without a test?
Is low iron the same as anaemia?
Can low iron cause headaches and dizziness?
Which iron supplement is best for women?
Studies behind this guide
- European Commission. Regulation (EU) No 432/2012 establishing a list of permitted health claims made on foods (iron); EFSA NDA Panel. Scientific opinion on iron-related health claims. EFSA Journal. 2009;7(9):1215. DOI 10.2903/j.efsa.2009.1215
- Weyand AC, Chaitoff A, Freed GL, Sholzberg M, Choi SW, McGann PT. Prevalence of iron deficiency and iron-deficiency anemia in US females aged 12–21 years, 2003–2020. JAMA. 2023;329(24):2191–2193. DOI 10.1001/jama.2023.8020
- Powers JM, Lim MY, Achebe MQ, et al. American Society of Hematology 2026 guidelines for diagnosis of iron deficiency. Blood Advances. 2026. DOI 10.1182/bloodadvances.2025015950
- Vaucher P, Druais PL, Waldvogel S, Favrat B. Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial. CMAJ. 2012;184(11):1247–54. DOI 10.1503/cmaj.110950
- Houston BL, Hurrie D, Graham J, et al. Efficacy of iron supplementation on fatigue and physical capacity in non-anaemic iron-deficient adults: a systematic review of randomised controlled trials. BMJ Open. 2018;8(4):e019240. PMID 29626044
- Mayo Clinic. Iron deficiency anemia: symptoms and causes; NIH Office of Dietary Supplements. Iron: fact sheet for health professionals.
- Pasricha SR, Low M, Thompson J, Farrell A, De-Regil LM. Iron supplementation benefits physical performance in women of reproductive age: a systematic review and meta-analysis. J Nutr. 2014;144(6):906–914.
- Iron and thermoregulation: a review. Crit Rev Food Sci Nutr. 1996;36(8):747–63. PMID 8989508
- Treister-Goltzman Y, Yarza S, Peleg R. Iron deficiency and nonscarring alopecia in women: systematic review and meta-analysis. Skin Appendage Disord. 2022;8(2):83–92. PMID 35415182
- Moiz B. Spoon nails: still seen in today’s world. Clin Case Rep. 2018;6(3):547–548. PMID 29531740
- Trotti LM, Becker LA. Iron for the treatment of restless legs syndrome. Cochrane Database Syst Rev. 2019;1:CD007834. DOI 10.1002/14651858.CD007834.pub3
- Barton JC, Barton JC, Bertoli LF. Pica associated with iron deficiency or depletion: clinical and laboratory correlates in 262 non-pregnant adult outpatients. BMC Hematol. 2010;10:9. DOI 10.1186/1471-2326-10-9
- Murray-Kolb LE, Beard JL. Iron treatment normalizes cognitive functioning in young women. Am J Clin Nutr. 2007;85(3):778–787. DOI 10.1093/ajcn/85.3.778
- ICMR-NIN. Nutrient Requirements for Indians, 2020 — iron chapter (RDA 29 mg women, 19 mg men; menstrual loss; 8% absorption; pregnancy; upper limit 45 mg; Uttar Pradesh ferritin survey); FSS (Health Supplements, Nutraceuticals…) Regulations, 2022 — up to one RDA per daily serving.
- Siegenberg D, Baynes RD, Bothwell TH, et al. Ascorbic acid prevents the dose-dependent inhibitory effects of polyphenols and phytates on nonheme-iron absorption. Am J Clin Nutr. 1991;53(2):537–41. PMID 1989423
- International Institute for Population Sciences. National Family Health Survey (NFHS-5), 2019–21: India fact sheet (anaemia).
- World Health Organization. Guideline on haemoglobin cutoffs to define anaemia in individuals and populations. Geneva: WHO; 2024.
- World Health Organization. WHO guideline on use of ferritin concentrations to assess iron status in individuals and populations. Geneva: WHO; 2020.