Iron Deficiency in Women: Symptoms You Shouldn't Ignore

Iron deficiency is one of the most common nutrient deficiencies I see in clinical practice, particularly in women. The frustrating part? Many women are told their symptoms are due to stress, ageing, being a busy parent, perimenopause, or simply having a lot on their plate.

Sometimes that's true. But sometimes the real issue is iron deficiency. And because symptoms often develop gradually, many women don't realise how much better they could feel until the deficiency is identified and treated.

What Does Iron Do?

Iron is essential for carrying oxygen throughout the body, producing energy, supporting brain function, maintaining healthy muscles, and regulating immune function. When iron levels become depleted, the body starts prioritising essential functions, which can result in a wide range of symptoms. Importantly, iron deficiency can occur even before anaemia develops. This means you can have normal haemoglobin levels but still experience symptoms related to low iron stores.

Common Symptoms of Iron Deficiency

Iron deficiency doesn't always present as extreme fatigue. Some of the most common symptoms include:

• Fatigue and low energy

• Reduced exercise tolerance

• Shortness of breath

• Brain fog

• Poor concentration

• Memory difficulties

• Dizziness

• Headaches

• Restless legs syndrome

• Hair shedding or thinning

• Feeling cold more often

• Heart palpitations

• Reduced mood and motivation

Many women describe feeling like they're constantly running on empty.

Others tell me they no longer recover from exercise the way they used to or struggle to make it through the afternoon without feeling exhausted.

Why Are Women So Commonly Affected?

There are several reasons women are at greater risk of iron deficiency.

Heavy Menstrual Bleeding

This is one of the most common causes.

Many women assume their periods are "normal" because they've always been that way.

In reality, changing a pad or tampon every 1-2 hours, passing large clots, bleeding for more than seven days, or needing double protection may indicate excessive blood loss.

Perimenopause

Heavy and unpredictable bleeding is extremely common during the menopausal transition.

For some women, years of heavier periods gradually deplete iron stores without them realising it.

Pregnancy and Postpartum

Iron requirements increase significantly during pregnancy, and some women enter pregnancy with depleted iron stores already.

Dietary Factors

Vegetarian and vegan diets can absolutely support healthy iron levels, but they often require more careful planning due to the lower absorption of non-haem iron sources.

Gastrointestinal Conditions

Conditions such as coeliac disease, inflammatory bowel disease, Helicobacter pylori infection, and some gastrointestinal surgeries can impair iron absorption.

Frequent Blood Donation

Regular blood donation is an often overlooked contributor to iron deficiency.

How Is Iron Deficiency Diagnosed?

Many people assume that a standard blood count is enough. It often isn't. A person can have normal haemoglobin levels while still having depleted iron stores. This is why ferritin, which reflects iron storage, is such an important marker. When evaluating iron deficiency, healthcare providers may assess:

• Ferritin

• Full blood count

• Iron studies

• Inflammatory markers when appropriate
  

Just as importantly, identifying the cause of iron deficiency is critical. Treating iron deficiency without understanding why it developed is only addressing half the problem.

What About Iron Supplements?

Iron supplements can be incredibly helpful when deficiency is present. However, not all iron supplements are equal. The highest dose is not always the best dose. Many people struggle with side effects such as:

• Constipation

• Nausea

• Abdominal discomfort

• Bloating
  

Current evidence suggests that dosing strategies, timing, formulation, and individual circumstances all influence tolerability and effectiveness. This is one reason why personalised advice can be valuable.

My Clinical Perspective

One of the biggest misconceptions I see is that fatigue automatically means someone needs iron supplements. Another is that iron deficiency only matters if anaemia develops. Neither is true. The first step is understanding what is actually happening. Why are iron levels low? Are heavy periods contributing? Could perimenopause be playing a role? Is there a gastrointestinal issue affecting absorption? Is dietary intake adequate? The goal isn't simply to raise a blood test result. The goal is to understand the full picture and address the underlying cause.

Key Takeaways

• Iron deficiency is extremely common in women.

• Symptoms can occur before anaemia develops.

• Fatigue is only one possible symptom.

• Heavy menstrual bleeding is a major contributor.

• Ferritin is often an important part of assessment.

• Identifying the cause is just as important as treating the deficiency.

• Effective treatment should be individualised and evidence-based.
  

If you're experiencing fatigue, brain fog, hair loss, reduced exercise tolerance, or suspect iron deficiency may be contributing to your symptoms, seeking appropriate assessment can be an important first step. You do not need to guess your way through your health. Sometimes the answer is simpler than you think.