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Iron Deficiency in Women: Symptoms, Causes and Food Sources

Published Nov 09 2026 6 min read
Iron Deficiency in Women: Symptoms, Causes and Food Sources

Iron deficiency is the most widespread nutritional disorder in the world. Women of reproductive age are among the most affected. 

Tiredness is often the first sign people notice, but low iron can affect energy, concentration, physical performance and overall quality of life long before the problem becomes obvious. The Institute of Nutrition and Fitness Sciences (INFS) offers a Women’s Health and Wellness course that explains how nutrition supports women’s health at every stage of life.

This blog explains the early signs, the main causes and the best iron deficiency symptoms and food sources so you can understand your body’s needs and know when to seek advice.

Why Women Are at Higher Risk of Iron Deficiency 

Women need more iron than men. Each month, menstrual bleeding removes iron from the body, so the body must keep replacing it.

The recommended daily intake is:

  • 18 mg for women of reproductive age

  • 8 mg for men

  • 27 mg during pregnancy, because the mothers blood volume expands and the baby needs iron to grow 

Iron needs change at different stages of life. This is why nutrition requirements for women by age should be considered alongside periods, pregnancy and menopause.

The World Health Organization (WHO) estimates that more than 2 billion people, about one-third of the worlds population, are anaemic. Iron deficiency is a leading cause .

Importance of Iron 

Iron is more than a "blood nutrient." Most of the body’s iron, about 3 g in a woman, is found in proteins involved in cellular respiration and oxygen transport. The main one is haemoglobin, which sits inside red blood cells. Iron also supports energy production, antioxidant defence and immune function.

Because free iron can damage cells and help some germs grow, the body controls iron very carefully. It regulates how much iron is absorbed, carried, stored and recycled. This is why both too little and too much iron can cause health problems .

Early Signs of Low Iron in Females

Iron deficiency often develops slowly. Many women put the symptoms down to stress, poor sleep or a busy schedule. Common signs include:

  • Persistent tiredness

  • Low stamina or weakness

  • Breathlessness during everyday activity

  • Poor concentration or "brain fog"

  • Pale skin

  • Dizziness or feeling unusually cold

  • Brittle nails, more hair shedding or a sore tongue

  • Reduced appetite

  • Cravings for ice or other non-food items, known as pica 

If several of these signs last for weeks, it is worth speaking to a doctor.

Main Causes of Iron Deficiency

Iron deficiency has several causes. The table below explains the most common ones.

Cause

What happens

Examples

Blood loss

Iron is lost along with red blood cells

Heavy or frequent periods; bleeding from stomach ulcers, polyps or, less often, bowel cancer

Reduced absorption

The gut cannot absorb enough iron from food

Coeliac disease, weight-loss surgery, bowel removal, some rare genetic conditions

Low intake or higher needs

Food does not meet the bodys needs

Pregnancy, restrictive diets, diets with few iron-rich foods

Dialysis-related losses 

Kidney failure and dialysis increase iron needs

Patients on dialysis, and people receiving erythropoiesis-stimulating agents (medicines that stimulate red blood cell production), who have particular iron needs 

In men and in women after menopause, low iron should not be blamed on diet alone. It often needs a check for bleeding in the digestive tract.

For women going through this stage of life, nutrition needs can change. You can read more in Menopause and Perimenopause Nutrition: A Simple Diet Guide for Hormones and Muscle. 

Heme vs Non-Heme Iron Foods

Dietary iron comes in two forms. Understanding these heme vs non-heme iron foods can help you plan meals more effectively.

Type

Common sources

How well the body absorbs it

Heme iron

Liver, shellfish, lean red meat, poultry and fish

Higher, about 15 to 35%

Non-heme iron

Lentils, chickpeas, kidney beans, soybeans, tofu, dark leafy greens, seeds, fortified cereals and dried fruits

Lower and more variable, but very important for vegetarian and vegan diets

Vegetarians can still get enough iron. The key is to eat iron-rich plant foods and to help the body absorb them better.

How to Improve Iron Absorption

Simple food pairings can make a real difference.

Ways to help absorption:

  • Add vitamin C-rich foods, such as lemon, amla, tomatoes, capsicum or oranges, to iron-rich meals. Vitamin C is one of the essential vitamins for womens health, and it can increase the absorption of plant iron considerably.

  • Combine plant iron with a small amount of meat or fish, when your diet allows. Heme iron can help the body absorb non-heme iron.

  • Cook acidic or moist dishes in cast-iron pans, which can add some iron to the food.

  • Soak, sprout or ferment lentils and grains. This reduces phytates, which block iron absorption.

Ways to reduce interference:

  • Avoid tea and coffee with meals. Tannins and polyphenols in these drinks can reduce iron absorption. Drinking them 1 to 2 hours away from meals is a practical habit.

  • Keep large servings of dairy or calcium supplements away from iron-rich meals, because calcium can compete with iron for absorption.

When to Seek Medical Assessment for Low Iron

It is not reliable to diagnose iron deficiency yourself. Its symptoms overlap with thyroid problems, poor sleep, mental health conditions and other nutrient shortages.

A doctor can check haemoglobin and iron levels, look for possible causes and decide whether iron supplements are right for you. Iron is essential, but more is not always better. Too much iron can increase oxidative stress and may be harmful in some conditions. Supplements should be guided by a medical  assessment and monitored, rather than taken long-term without checks .

Practical Takeaways

  • Women with heavy periods, pregnancy, restrictive eating patterns or ongoing tiredness should consider an iron check.

  • Pair plant iron with vitamin C, and keep tea, coffee and calcium away from iron-rich meals.

  • Vegetarian diets can support healthy iron levels with careful meal planning and regular follow-up.

  • Unexplained iron deficiency, especially after menopause or in men, needs medical evaluation.

Conclusion

Iron deficiency in women is common, but it is manageable. Knowing the early signs, understanding the causes and choosing the right foods can help you keep your energy and health steady. Balanced meals, smart food pairings and medical checks when needed are the most reliable route.

Good nutrition is a key part of womens health and nutrition at every stage of life. If you want to learn more, explore these INFS courses:

Frequently Asked Questions

1. What are the symptoms of low iron in a woman?

The most common symptoms are tiredness, weakness, breathlessness, poor concentration, pale skin and dizziness. Some women also notice brittle nails, hair shedding, reduced appetite or cravings for non-food items such as ice. If these last for several weeks, speak to a doctor.

2. What happens when your iron is low in women?

Low iron means the body has less material to make haemoglobin, the protein that carries oxygen in the blood. This can leave you feeling tired and short of breath, and can affect your focus and physical performance.

3. How to boost iron levels quickly?

There is no quick fix. Iron levels build up gradually through regular iron-rich meals, good food pairings and, where needed, supplements prescribed by a doctor. Do not start high-dose iron tablets on your own, because too much iron can be harmful.

4. Which fruits are high in iron?

Most fresh fruits contain only small amounts of iron. Vitamin C-rich fruits, such as oranges and amla, do not add much iron, but they help your body absorb iron from other foods. 

5. What is a dangerously low iron level?

Only a blood test can show how low your iron is, and a doctor will interpret the results. Seek urgent medical care if you have severe tiredness, chest pain, fainting or shortness of breath while resting.

Disclaimer

The information in this blog is for general educational purposes only. It is not a substitute for professional medical advice, diagnosis or treatment. Always speak with a qualified doctor or healthcare professional before starting, stopping or changing any diet, iron supplement or medication, especially if you are pregnant, have a medical condition or take regular medicines.

References

  1. Trumbo, P., Yates, A. A., Schlicker, S. & Poos, M. Dietary reference intakes: vitamin A, vitamin K, arsenic, boron, chromium, copper, iodine, iron, manganese, molybdenum, nickel, silicon, vanadium, and zinc. Journal of the American Dietetic Association, 101, 294–301 (2001).

  2. Coad, J. & Pedley, K. Iron deficiency and iron deficiency anaemia in women. Scandinavian Journal of Clinical and Laboratory Investigation, 74, 82–89 (2014).

  3. Ganz, T. Systemic iron homeostasis. Physiological Reviews, 93, 1721–1741 (2013).

  4. American Society of Hematology. Iron-Deficiency Anemia. https://www.hematology.org/education/patients/anemia/iron-deficiency

  5. Hanif, N., Rout, P. & Anwer, F. Iron Deficiency and Microcytic Hypochromic Anemia. In StatPearls. StatPearls Publishing, Treasure Island (FL). [Publication year to be confirmed before publishing.]

  6. https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/