Discover the hidden signs of iron deficiency in women, why ferritin matters more than haemoglobin, and how iron testing, supplementation, and iron infusions can help restore energy and wellbeing.
Iron deficiency is one of the most common nutritional deficiencies in women, yet it remains one of the most frequently overlooked causes of fatigue, hair loss, brain fog, and poor wellbeing. Many women are told their blood tests are "normal" despite experiencing symptoms that significantly affect their quality of life. The reason? Often, the wrong blood test has been used.
We regularly see women struggling with symptoms of low iron levels who have never had their iron stores properly assessed. In this article, we'll explain:
Why standard blood tests can miss iron deficiency
The symptoms of low ferritin in women
Why perimenopausal and menopausal women are particularly at risk
How our Iron Health Programme investigates iron properly
When iron supplementation or iron infusion therapy may be appropriate
Why Standard Iron Tests Often Miss Iron Deficiency
Many people believe that checking iron levels means measuring haemoglobin. While haemoglobin is important, it only tells part of the story.
Haemoglobin is the oxygen-carrying protein found within red blood cells. When haemoglobin falls below a certain level, anaemia is diagnosed. However, by the time this happens, iron stores may have been depleted for months or even years.
The Importance of Ferritin
Ferritin is the body's iron storage protein and provides a much clearer picture of your iron reserves.
You can have:
✅ Normal haemoglobin❌ Low ferritin❌ Significant symptoms
This condition is known as iron deficiency without anaemia, and it is incredibly common in women.
Many laboratories use wide reference ranges and only flag ferritin when levels become extremely low. However, many women experience symptoms long before reaching these thresholds.
Symptoms of Low Ferritin in Women
Low iron stores can affect almost every system in the body.
Common symptoms include:
Persistent Fatigue
Feeling exhausted despite getting enough sleep is often one of the earliest signs.
Brain Fog and Poor Concentration
Difficulty focusing, remembering information, or finding the right words can occur when iron stores are depleted.
Hair Loss and Hair Thinning
Research suggests ferritin levels below 40 µg/L are associated with increased hair shedding and reduced hair density.
Breathlessness
Women may notice they become short of breath climbing stairs or exercising, even when they were previously fit and active.
Low Mood and Anxiety
Iron is involved in the production of dopamine and serotonin, neurotransmitters that influence mood, motivation, and mental wellbeing.
Other Symptoms
Restless legs
Palpitations
Cold hands and feet
Brittle nails
Pale skin
Reduced exercise performance
Why Women Are More Likely to Develop Iron Deficiency
Heavy Periods and Menstrual Blood Loss
The most common cause of iron deficiency in women is blood loss through menstruation.
Women with:
Heavy periods
Flooding
Fibroids
Adenomyosis
Perimenopausal bleeding changes
can lose iron faster than it can be replaced through diet.
Perimenopause and Iron Deficiency
During perimenopause, hormonal fluctuations can lead to:
Heavier periods
Longer periods
More frequent cycles
Over time, this can significantly deplete iron stores.
Dietary Factors
Women following vegetarian or vegan diets may be at increased risk because plant-based iron is less easily absorbed than iron from animal sources.
Absorption can also be reduced by:
Tea and coffee
Calcium supplements
Certain medications
Coeliac disease
Helicobacter pylori infection
Iron Deficiency and Menopause: Why Symptoms Can Be Confused
One of the biggest challenges is that low ferritin symptoms often overlap with menopause symptoms.
Both can cause:
Fatigue
Brain fog
Poor concentration
Low mood
Hair changes
Reduced motivation
This means iron deficiency may be missed or wrongly attributed solely to hormonal changes.
At Bristol Health Hub, we frequently assess both hormone health and iron status to ensure important deficiencies are not overlooked.
How We Assess Iron Properly
Our Iron Health Programme is designed to identify iron deficiency accurately and provide a personalised treatment plan.
Blood Tests Included
We assess:
Ferritin
Full Blood Count (FBC)
Active B12
Thyroid Function Tests
C-Reactive Protein (CRP)
This allows us to understand the full picture rather than relying on haemoglobin alone.
What Is an Optimal Ferritin Level?
While laboratory ranges vary, many women report feeling significantly better when ferritin levels reach:
70–100 µg/L
At this level many women experience improvements in:
Energy
Concentration
Exercise tolerance
Hair health
Mood
Our goal is not simply to prevent anaemia but to optimise wellbeing.
Treatment Options for Low Iron:
Iron Supplements
Many women benefit from iron bisglycinate, which is often gentler on the stomach than traditional iron preparations.
To improve absorption:
Take with Vitamin C
Avoid tea and coffee around supplementation
Separate from calcium supplements
Take away from thyroid medication
Dietary Support
We help women increase iron intake through practical dietary strategies and identify potential absorption issues where appropriate.
Addressing the Underlying Cause
Simply replacing iron is not enough.
We also investigate:
Heavy menstrual bleeding
Perimenopausal hormone changes
Dietary factors
Gastrointestinal causes
Medication effects
When Is an Iron Infusion Recommended?
For some women, oral iron supplements are not enough.
An iron infusion may be considered when:
Ferritin is significantly depleted
Symptoms are severe
Oral iron is poorly tolerated
Absorption is impaired
Faster replenishment is required
Our clinician-led Iron Infusion Treatment Package combines:
Advanced blood testing
Iron sucrose infusion therapy
Follow-up blood testing
Nutritional support
Ongoing monitoring
This provides a comprehensive approach to restoring iron levels safely and effectively.
Frequently Asked Questions About Iron Deficiency
Can I Have Low Iron Without Anaemia?
Yes. Iron deficiency without anaemia is extremely common and can cause significant symptoms even when haemoglobin levels remain normal.
What Ferritin Level Causes Symptoms?
Symptoms can occur at various levels, but many women report fatigue, hair loss, and brain fog when ferritin falls below 50 µg/L.
Can Low Iron Cause Anxiety?
Low ferritin may contribute to anxiety, low mood, reduced resilience, and poor concentration due to its role in neurotransmitter production.
Can Menopause Cause Low Iron?
Menopause itself does not cause iron deficiency, but the heavy and irregular bleeding often experienced during perimenopause can significantly deplete iron stores.
Take the Next Step
If you're struggling with persistent fatigue, brain fog, hair loss, low mood, or breathlessness and have been told your blood tests are "normal", it may be time to take a closer look at your iron stores.
Our Iron Health Programme and Iron Infusion Service are designed to identify the root cause of your symptoms and create a personalised plan to help restore your energy, vitality, and wellbeing.
Book Your Iron Health Assessment Today
Discover whether low ferritin could be the missing piece of your health puzzle and take the first step towards feeling like yourself again.