Understanding Iron Deficiency
What is Iron Deficiency?
Iron deficiency is the most common nutritional deficiency in the United Kingdom, yet it is frequently dismissed or misdiagnosed. Iron is essential for producing haemoglobin — the protein in red blood cells that carries oxygen from your lungs to every cell in your body. When your iron stores fall too low, haemoglobin production is impaired and oxygen delivery suffers throughout the body.
In health-conscious communities like Esher, iron deficiency can be particularly common among active individuals, women managing busy professional and family lives, and those following plant-based diets. The symptoms are often subtle at first — a vague tiredness that gradually worsens, increasing difficulty focusing, a sense that you just cannot recover — before becoming more pronounced and disruptive.
Common Symptoms
Persistent fatigueExhaustion that rest does not resolve — the most universal and disruptive symptom.
Brain fogDifficulty concentrating, forgetfulness, reduced mental sharpness.
BreathlessnessFeeling short of breath with exertion that previously felt manageable.
Hair thinning and lossNoticeable shedding or thinning — often distressing and a common driver for seeking help.
PalpitationsThe heart working harder to compensate for reduced oxygen-carrying capacity.
Reduced exercise tolerancePerformance suffers; recovery takes longer. Common in Esher's active community.
Who is Most at Risk?
- Women with heavy periods — chronic blood loss depletes iron faster than diet replenishes it
- Vegans and vegetarians — plant-based iron is significantly less bioavailable than haem iron from animal sources
- Endurance athletes and very active individuals — high physical demands substantially increase iron requirements
- Post-surgical or post-partum patients — blood loss causes rapid iron depletion that is difficult to correct with tablets alone
- Those with IBD, coeliac disease, or gut surgery — impaired absorption means oral iron simply cannot get through effectively
Iron Deficiency vs Iron Deficiency Anaemia
Iron deficiency describes depleted iron stores — low ferritin — which can cause significant symptoms even when haemoglobin remains within the normal range. Iron deficiency anaemia is the more advanced state where haemoglobin has fallen below normal. Both conditions can respond well to IV iron therapy. Dr Nelson assesses the full clinical picture — including ferritin, haemoglobin, and transferrin saturation — before recommending treatment.
Why Oral Iron Tablets Often Fail
Oral iron supplements are poorly absorbed — typically only 10–20% of what you swallow actually reaches your bloodstream, and that proportion is further reduced in those with gut conditions or inflammation. The side effects of nausea, constipation, and stomach cramps are common enough that many patients quietly stop taking their tablets within weeks, leaving iron levels unchanged. IV iron bypasses the gut entirely, delivering a full therapeutic dose directly into the bloodstream.
