Sickle cell anemia cannot be prevented in a person who has already inherited it, because it is a genetic condition present from conception. What can be prevented is the chance of passing it on without knowing, through carrier testing and genetic counseling, and many of its serious complications, through early diagnosis and good ongoing care. Lifestyle does not cause or cure the disease, but it plays a real part in reducing pain crises and other problems.
In my practice, I often meet people worried about their risk because of family history. This article explains how sickle cell anemia is inherited, what families can do before and during pregnancy, and how complications are prevented after diagnosis.
What Is Sickle Cell Anemia?
Sickle cell anemia is an inherited blood disorder in which red blood cells contain an abnormal form of hemoglobin called hemoglobin S. When oxygen levels drop, hemoglobin S molecules stick together into long strands that stiffen the cell and bend it into a crescent, the characteristic sickle shape.
Sickled cells are fragile and sticky. They break down after about 10 to 20 days instead of the normal 120, causing chronic anemia, and they block small blood vessels, causing pain and organ damage. It is the most common and usually most severe form of sickle cell disease.
The gene is most common in people with ancestry from sub-Saharan Africa, the Mediterranean, the Middle East, India, and parts of Central and South America. Carrying one copy offers some protection against severe malaria, which is why it became common in those regions.
How Sickle Cell Anemia Is Inherited
The cause is a single change in the HBB gene on chromosome 11, which provides instructions for the beta chain of hemoglobin. The change swaps one amino acid, producing hemoglobin S.
Everyone inherits two copies of this gene, one from each parent. Someone with one sickle gene and one normal gene has sickle cell trait. People with the trait are usually healthy but can pass the gene on. Sickle cell anemia occurs when a child inherits a sickle gene from both parents.
| Parents | Chance in each pregnancy |
|---|---|
| Both carriers (trait) | 25% sickle cell anemia, 50% trait, 25% unaffected |
| One carrier, one unaffected | 50% trait, 50% unaffected; no child has sickle cell anemia |
| One with sickle cell anemia, one unaffected | All children have the trait |
| One with sickle cell anemia, one carrier | 50% sickle cell anemia, 50% trait |
These odds apply afresh to every pregnancy. Two carrier parents could have several affected children or none. A parent carrying a different hemoglobin variant, such as hemoglobin C or beta thalassemia, can also produce related forms of sickle cell disease.
Can Sickle Cell Anemia Be Prevented Before Birth?
The most effective form of prevention of sickle cell anemia happens before a child is born, by helping at-risk couples make informed decisions.
Carrier screening
A simple blood test, usually hemoglobin electrophoresis or a similar method, shows whether a person carries hemoglobin S. Testing is recommended for anyone from a higher-risk background who is planning a family, ideally before pregnancy. Many people with the trait do not know they have it.
Genetic counseling
If both partners are carriers, a genetic counselor explains the risk, what the condition involves, and the options available, without steering the couple toward any particular choice.
Reproductive options
- Prenatal diagnosis: chorionic villus sampling or amniocentesis during pregnancy can show whether the baby is affected.
- Preimplantation genetic testing: with IVF, embryos can be tested and an unaffected embryo selected.
- Donor eggs or sperm, or adoption, for couples who choose them.
- Many couples choose to proceed naturally, using the information to prepare for early care.
Early Detection: Newborn Screening
Many countries screen every newborn for sickle cell disease with a heel-prick blood test. Early diagnosis matters because infants with sickle cell anemia are at high risk of serious infections once the protective effect of fetal hemoglobin fades in the first months of life. Our article on sickle cell anemia in pediatric patients covers early childhood care in detail.
Early symptoms include painful swelling of the hands and feet, jaundice, tiredness, and frequent infections. Other conditions that can resemble sickle cell disease, such as thalassemia and other hemolytic anemias, are distinguished by the same laboratory tests.
Preventing Complications After Diagnosis
Once someone has the condition, prevention shifts to avoiding complications such as chronic anemia, pain crises, stroke, and infection. This is where modern care has made the biggest difference to the life span of sickle cell patients.
Medical measures
- Daily penicillin for young children to prevent serious bacterial infections.
- Vaccinations, including pneumococcal, meningococcal, and annual influenza vaccines.
- Hydroxyurea, which raises fetal hemoglobin and reduces pain crises, acute chest syndrome, and the need for transfusions.
- Transcranial Doppler ultrasound in children to identify stroke risk, with regular transfusions for those at high risk.
- Folic acid, because the marrow works overtime to replace destroyed cells.
Lifestyle measures
- Drink plenty of fluids; dehydration encourages sickling.
- Avoid extreme cold, sudden temperature changes, and overheating.
- Pace strenuous exercise and rest when needed.
- Avoid smoking and limit alcohol.
- Take care at high altitude and on unpressurized flights, where oxygen is lower.
- Manage stress and keep regular check-ups.
Curative treatments
A bone marrow (stem cell) transplant can cure sickle cell anemia, most successfully in children with a matched sibling donor. Gene therapies have also been approved in some countries for selected patients. Both are intensive and not suitable for everyone.
For a broader overview of the condition, see our sickle cell guide.
When to See a Doctor
See a doctor for carrier testing if sickle cell disease runs in your family or you are from a higher-risk background and planning a pregnancy. Anyone with sickle cell anemia needs urgent care for fever of 38.3°C (101°F) or higher, chest pain or breathing trouble, severe pain not controlled at home, sudden weakness or trouble speaking, or a painful erection lasting more than a few hours.
Frequently Asked Questions
Can you get sickle cell anemia later in life?
No. You are born with it or you are not. However, milder forms of sickle cell disease are sometimes not diagnosed until later childhood or adulthood if screening was not done.
Can two people with sickle cell trait have a healthy baby?
Yes. In each pregnancy there is a 75% chance the child will not have sickle cell anemia, though half of all children would be expected to carry the trait. Genetic counseling helps couples understand these odds.
Can diet or lifestyle prevent sickle cell anemia?
No lifestyle factor can prevent or reverse the genetic change. Healthy habits, especially good hydration and avoiding temperature extremes, reduce the frequency of pain crises and other complications.
Does sickle cell trait turn into sickle cell anemia?
No. The trait is a stable carrier state and never becomes the disease. Rarely, people with the trait have problems under extreme conditions such as severe dehydration or intense exertion at altitude.
Key Takeaways
- Sickle cell anemia is inherited and cannot be prevented once a person has it.
- Carrier screening and genetic counseling are the main ways to prevent passing it on unknowingly.
- Newborn screening allows early infection protection and monitoring.
- Medicines, vaccines, hydration, and regular care prevent many complications.
- Stem cell transplant and gene therapy offer a cure for some patients.
