Some types of anemia are inherited, but most are not

Whether anemia is genetic depends entirely on which type you have. Some forms—like sickle cell disease and thalassemia—are caused by inherited mutations in genes that control how your body makes hemoglobin, the protein that carries oxygen in red blood cells. If both your parents carry the gene, you will inherit the condition. Other types, like iron-deficiency anemia or anemia from chronic kidney disease, develop because of what happens in your life—diet, blood loss, illness—not because of genes you inherited.

The distinction matters because it changes how the condition behaves, how it's treated, and whether your children might develop it. A genetic anemia typically appears the same way in everyone who carries the mutation. A non-genetic anemia can vary widely depending on its cause and how severe that cause becomes.

Key Takeaways

  • Sickle cell disease, thalassemia, and hereditary spherocytosis are inherited from parents and caused by specific gene mutations that affect red blood cell structure or hemoglobin production.
  • Iron-deficiency anemia, anemia from bleeding, and anemia from chronic illness develop because of circumstances in your life, not inherited genes, and can happen to anyone.
  • If you have an inherited form of anemia, genetic counseling can help you understand the risk to your children and what to expect as the condition progresses.
  • A blood test and family history are usually enough to determine whether your anemia is genetic; genetic testing is not always necessary.

The inherited forms: how they pass from parent to child

Sickle cell disease occurs when you inherit a mutated hemoglobin gene from both parents. The mutation causes red blood cells to become rigid and crescent-shaped under low oxygen, which blocks blood vessels and causes pain, organ damage, and hemolytic anemia (the breakdown of red blood cells faster than the body can replace them). If you inherit the gene from only one parent, you have sickle cell trait—you typically have no symptoms but can pass the gene to your children.

Thalassemia is a group of inherited disorders affecting hemoglobin production. The most severe form, thalassemia major, requires regular blood transfusions and iron chelation therapy (medication to remove excess iron). Thalassemia trait, inherited from one parent, causes mild or no symptoms. Both forms follow the same inheritance pattern as sickle cell: you need the gene from both parents for the severe version, one parent for the milder version.

Hereditary spherocytosis causes red blood cells to become sphere-shaped and fragile, leading to hemolysis. It is usually inherited from one parent (autosomal dominant inheritance), meaning you need the gene from only one parent to develop the condition. Severity varies even within families.

Other inherited anemias include glucose-6-phosphate dehydrogenase (G6PD) deficiency, which makes red blood cells vulnerable to breakdown when exposed to certain medications or foods, and hereditary persistence of fetal hemoglobin, which is usually benign.

The acquired forms: anemia from circumstances, not genes

Most people with anemia have forms that develop during their lifetime and are not inherited. Iron-deficiency anemia is the most common type worldwide and develops when your body does not have enough iron to make hemoglobin. Causes include heavy menstrual bleeding, gastrointestinal bleeding (from ulcers, polyps, or inflammatory bowel disease), poor dietary intake, or pregnancy. Your children will not inherit this condition unless they also develop iron deficiency.

Anemia of chronic disease occurs in people with long-term illnesses like rheumatoid arthritis, cancer, kidney disease, or heart failure. The illness itself disrupts how your body produces red blood cells or how long they survive. This type is not genetic and cannot be passed to family members.

Hemolytic anemia can be inherited (like sickle cell) or acquired. Acquired hemolytic anemia develops when your immune system attacks your own red blood cells (autoimmune hemolytic anemia), when you have a severe infection, or when certain medications trigger red blood cell breakdown. None of these causes are genetic.

Vitamin B12 and folate deficiency anemias result from poor diet, malabsorption (your intestines cannot absorb these vitamins properly), or certain medications. While some people have genetic conditions that affect B12 absorption, most B12 deficiency develops from lifestyle or medical factors, not inherited genes.

How to know whether your anemia is genetic

Your doctor typically determines this through your medical history and a blood test. If you have anemia and your parents or siblings also have anemia, or if you developed anemia in childhood without an obvious cause like bleeding or poor diet, genetic anemia is more likely. If you developed anemia as an adult after a clear trigger—heavy periods, a bleeding ulcer, a new diagnosis of kidney disease—it is almost certainly not genetic.

A complete blood count (CBC) and blood smear (looking at red blood cells under a microscope) can reveal the shape and size of your red blood cells, which narrows down the type. Hemoglobin electrophoresis, a test that separates different types of hemoglobin, can diagnose sickle cell disease and thalassemia. Genetic testing—sequencing the genes involved in red blood cell production—is available but usually only ordered when the diagnosis is unclear or when you need to know your risk of passing the condition to children.

If your doctor suspects an inherited form, they may refer you to a hematologist (blood specialist) or genetic counselor. A genetic counselor can explain your specific condition, discuss inheritance patterns, and help you understand the risk to your children.

What inheritance patterns mean for your children

If you have an inherited anemia, the risk to your children depends on the inheritance pattern and whether your partner carries the gene. For autosomal recessive conditions like sickle cell and thalassemia major, your children are at risk only if your partner also carries the gene. If your partner does not carry it, your children will either be unaffected or carry the trait (one copy of the gene) with no symptoms.

For autosomal dominant conditions like hereditary spherocytosis, each child has a 50% chance of inheriting the gene and developing the condition, regardless of your partner's genes. Genetic counseling before having children can help you understand these odds and explore options like prenatal testing or preimplantation genetic diagnosis (testing embryos before implantation during in vitro fertilization).

If you have a non-genetic anemia—iron deficiency, anemia from kidney disease, or autoimmune hemolytic anemia—your children will not inherit the condition itself. However, they may inherit factors that increase their risk, such as a tendency toward heavy menstrual bleeding or a genetic predisposition to autoimmune disease.

Living with genetic anemia: treatment and monitoring

Inherited anemias require ongoing management tailored to the specific type. Sickle cell disease may involve pain management, hydroxyurea (a medication that reduces sickling), blood transfusions, and monitoring for organ damage. Thalassemia major requires regular transfusions and iron chelation. Hereditary spherocytosis may be managed with folic acid supplementation, and severe cases may benefit from spleen removal.

Non-genetic anemias are treated by addressing the underlying cause: iron supplementation for iron deficiency, treating the bleeding source, managing the chronic disease, or supplementing B12 or folate. Once the cause is resolved, the anemia often improves or resolves entirely.

Regardless of type, regular blood tests help your doctor monitor your hemoglobin level and adjust treatment as needed. If you have a genetic form, periodic screening for complications—like organ damage in sickle cell disease or iron overload in thalassemia—is part of standard care.

Frequently Asked Questions

Can I develop an inherited anemia if my parents don't have it?

Yes, if both your parents carry a recessive gene (like for sickle cell or thalassemia) but don't have symptoms themselves, you can inherit two copies and develop the condition. This is more common in people of African, Mediterranean, or Southeast Asian descent, where these genes are more prevalent. A genetic counselor can explain your family's specific risk.

If I have iron-deficiency anemia, will my children get it?

No, iron-deficiency anemia is not inherited. Your children will not develop it unless they also experience iron loss or poor iron intake. However, if you have heavy menstrual bleeding or a bleeding disorder, your children may inherit the bleeding tendency, which could lead to anemia if not managed.

Do I need genetic testing to know if my anemia is genetic?

Not always. A blood smear, hemoglobin electrophoresis, and your family history usually provide enough information. Genetic testing is most useful when the diagnosis is unclear, when you're planning pregnancy, or when you want to know whether you carry a gene that could affect your children.

What does it mean if I have sickle cell trait?

You carry one copy of the sickle cell gene but typically have no symptoms or only mild symptoms. You cannot develop sickle cell disease unless your partner also carries the gene. If both of you do, each child has a 25% chance of having sickle cell disease. Genetic counseling before pregnancy can help you understand your options.

Can anemia develop later in life if it's genetic?

Yes. Some inherited anemias like hereditary spherocytosis may not cause noticeable symptoms until adulthood, when stress on the body (infection, pregnancy, surgery) triggers hemolysis. Others, like sickle cell disease, typically appear in childhood. If you develop anemia as an adult without a clear cause, your doctor will investigate whether an inherited condition is responsible.