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Symptoms of Iron Deficiency – Causes & Treatment

Iron deficiency is one of the most common nutritional deficiencies worldwide and can cause a wide range of symptoms. Typical signs include fatigue, pale skin, and difficulty concentrating.

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Iron deficiency is one of the most common nutritional deficiencies worldwide and can cause a wide range of symptoms. Typical signs include fatigue, pale skin, and difficulty concentrating.

What is Iron Deficiency?

Iron deficiency occurs when the body does not have enough iron to carry out all its essential functions. Iron is a vital trace element needed primarily for the production of hemoglobin – the red pigment in blood that transports oxygen from the lungs to all organs and tissues. When iron levels are too low, this oxygen transport is impaired, leading to a variety of symptoms.

Common Symptoms of Iron Deficiency

The symptoms of iron deficiency often develop gradually and can be nonspecific. They can be grouped into general complaints and specific physical signs:

General Complaints

Fatigue and exhaustion: One of the most common symptoms. Affected individuals feel persistently tired and lacking in energy, even after adequate sleep.
Difficulty concentrating: Reduced cognitive performance, forgetfulness, and trouble focusing are frequent complaints.
Headaches: Often caused by reduced oxygen supply to the brain.
Dizziness: Especially when standing up quickly or during physical exertion.
Irritability and mood swings: Iron deficiency can also affect mental well-being.

Physical Signs

Pale skin and mucous membranes: A characteristic sign in advanced iron deficiency or iron deficiency anemia.
Brittle nails and hair loss: Iron is important for the growth of nails and hair. Deficiency can lead to brittleness and increased hair shedding.
Cracks at the corners of the mouth (angular cheilitis): Small, painful fissures at the corners of the mouth can indicate iron deficiency.
Smooth, sore tongue (glossitis): The tongue may appear red and inflamed in iron deficiency.
Shortness of breath: Even mild physical activity can cause breathlessness.
Rapid heartbeat (tachycardia): The heart attempts to compensate for the lack of oxygen by beating faster.
Restless legs syndrome: Uncomfortable sensations in the legs, especially during rest and at night.
Pica syndrome: An unusual craving for non-food items such as dirt or ice – a rare but recognized sign of iron deficiency.

Causes of Iron Deficiency

Iron deficiency can have several causes:

Inadequate dietary intake: A diet low in iron, for example in vegan or vegetarian diets without appropriate compensation.
Increased demand: During pregnancy, breastfeeding, or periods of rapid growth in children and adolescents.
Blood loss: Heavy menstrual bleeding, chronic gastrointestinal bleeding (e.g., from peptic ulcers or bowel disease), or surgical procedures.
Impaired absorption: Conditions such as celiac disease, Crohn's disease, or states following gastric surgery can impair iron absorption in the intestine.

At-Risk Groups

Certain groups of people are particularly prone to iron deficiency:

Women of childbearing age (due to menstruation)
Pregnant and breastfeeding women
Infants, children, and adolescents during growth phases
Vegans and vegetarians
Competitive athletes
People with chronic gastrointestinal conditions

Diagnosis

A doctor can diagnose iron deficiency through a blood test. The following values are typically measured:

Ferritin: The body's iron storage protein – a low ferritin level is the earliest sign of iron deficiency.
Serum iron: Indicates the amount of iron currently available in the blood.
Transferrin saturation: Shows how well the transport protein transferrin is loaded with iron.
Hemoglobin (Hb): A low hemoglobin level indicates iron deficiency anemia.

Treatment

Treatment depends on the cause and severity of the iron deficiency:

Dietary adjustments: Increased consumption of iron-rich foods such as red meat, legumes, spinach, whole grains, and pumpkin seeds. Consuming vitamin C alongside these foods enhances iron absorption.
Iron supplements: If a deficiency is confirmed, a doctor will often recommend oral iron supplements (e.g., ferrous sulfate or ferrous gluconate). These should always be taken under medical supervision.
Intravenous iron therapy: In cases of severe anemia or impaired absorption, iron can be administered directly into a vein.
Treatment of the underlying condition: Chronic bleeding or absorption disorders require treatment of the root cause.

When to See a Doctor

If you experience persistent fatigue, pale skin, hair loss, or other symptoms mentioned above, you should seek medical advice. Self-medication with iron supplements without a blood test is not recommended, as iron overload can also be harmful to health.

References

World Health Organization (WHO): Iron Deficiency Anaemia: Assessment, Prevention and Control. WHO, Geneva, 2001. Available at: https://www.who.int/nutrition/publications/micronutrients/anaemia_iron_deficiency/WHO_NHD_01.3/en/
Kasper, D. L. et al.: Harrison's Principles of Internal Medicine, 20th edition, McGraw-Hill Education, 2018.
Camaschella, C.: Iron-Deficiency Anemia. New England Journal of Medicine, 2015; 372(19):1832-1843. DOI: 10.1056/NEJMra1401038

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