Which are the causes of Anemia?

TL;DR: Anemia occurs when your blood lacks enough healthy red blood cells or hemoglobin to carry adequate oxygen to your body’s tissues, often caused by nutritional deficiencies, chronic blood loss, or bone marrow disorders. While some forms are hereditary, others are acquired through environmental factors, infections, or underlying autoimmune processes, making the specific cause dependent on the underlying type of anemia.

What are the primary causes of anemia?

At its core, anemia is not a single disease but a clinical manifestation of an underlying issue. The causes generally fall into three categories: decreased production of red blood cells, increased destruction of red blood cells (hemolysis), or blood loss. For example, iron deficiency is the most common cause globally, where the body lacks the raw materials to build hemoglobin. In other cases, the bone marrow may fail to produce enough cells, or the body may prematurely destroy them due to mechanical stress or internal signals.

Is anemia hereditary?

Some forms of anemia are strictly genetic. Inherited anemias, such as sickle cell disease or thalassemia, occur when a person inherits specific gene mutations from one or both parents. These mutations alter the structure of hemoglobin or the shape of the red blood cell itself. In the DiseaseMaps community, we have seen 114 people with anemia share their experiences, highlighting that for those with genetic variants, the condition is often lifelong and requires ongoing management by a hematologist.

What environmental and secondary factors trigger anemia?

Beyond genetics, anemia can be triggered by a wide range of external and physiological factors:

• Nutritional Deficiencies: Low intake of iron, Vitamin B12, or folate prevents the body from synthesizing healthy cells.


• Chronic Blood Loss: Conditions such as peptic ulcers, heavy menstrual cycles, or gastrointestinal cancers cause a slow, steady loss of blood.


• Autoimmune Responses: In autoimmune hemolytic anemia, the immune system mistakenly identifies red blood cells as foreign invaders and destroys them.


• Infections and Metabolic Issues: Chronic diseases like kidney failure can impair the production of erythropoietin, a hormone essential for red blood cell creation.

What is the difference between a cause and a risk factor?

It is helpful to view anemia through the lens of a car engine. A "cause" is the direct reason the engine stops—perhaps the fuel line is cut (blood loss) or the factory built the engine with the wrong parts (genetic mutation). A "risk factor," however, is a condition that increases the likelihood of the problem occurring. For example, a strict vegan diet is a risk factor for B12 deficiency, while pregnancy is a risk factor for iron deficiency due to the increased demand for blood volume. Identifying the risk factor is often the first step toward finding the root cause.

What does current research say about the etiology of anemia?

While the causes of common anemia are well-understood, medical researchers are currently focusing on the complex signaling pathways in the bone marrow. Modern studies are investigating "anemia of chronic disease," where inflammation blocks the body’s ability to use stored iron. Researchers are also using CRISPR gene-editing technology to explore potential cures for inherited hemoglobinopathies, aiming to correct the genetic instructions that lead to abnormal red blood cell development.

Next steps

• Consult a hematologist to determine your specific type of anemia through a Complete Blood Count (CBC) and iron studies.


• Keep a detailed log of your symptoms and dietary habits to share during your clinical evaluation.


• Join the DiseaseMaps.org community to connect with others managing similar blood disorders.


• Speak with a genetic counselor if your physician suspects an inherited form of the condition.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases (GARD) Information Center.


• Orphanet: The portal for rare diseases and orphan drugs.


• OMIM (Online Mendelian Inheritance in Man): A catalog of human genes and genetic disorders.


• World Health Organization (WHO) - Global prevalence and causes of anemia.