Sickle Cell Anemia

Sickle Cell Anemia

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Sickle cell anemia is an inherited blood disorder that mostly affects people of African ancestry, but also occurs in other ethnic groups, including people who are of Mediterranean and Middle Eastern descent.

More than 70,000 Americans have sickle cell anemia. And about 2 million Americans — including 1 in 12 African Americans — have sickle cell trait, which means they carry a single gene for the disease and can pass this gene along to their children, but do not have the disease itself.

What Is Sickle Cell Anemia?

Sickle cell anemia is a blood disorder that affects hemoglobin (pronounced: hee-muh-glow-bin), the protein found in red blood cells (RBCs) that helps carry oxygen throughout the body.

Sickle cell anemia occurs when a person inherits two abnormal genes (one from each parent) that cause their RBCs to change shape. Instead of being flexible and disc-shaped, these cells are more stiff and curved in the shape of the old farm tool known as a sickle — that's where the disease gets its name. The shape is similar to a crescent moon.


Red blood cells with normal hemoglobin (hemoglobin A, or HbA) move easily through the bloodstream, delivering oxygen to all of the cells of the body. Normal RBCs are shaped like discs or doughnuts with the centers partially "scooped out" and are soft and flexible. They can easily "squeeze" through even very small blood vessels.

What Happens With Sickle-Shaped Cells

Sickle cell anemia occurs because an abnormal form of hemoglobin (HbS) is produced. HbS molecules tend to clump together, making red blood cells sticky, stiff, and more fragile, and causing them to form into a curved, sickle shape.

RBCs containing HbS can go back and forth between being shaped normally and being sickle shaped until they eventually become sickle shaped permanently. Instead of moving through the bloodstream easily, these sickle cells can clog blood vessels and deprive the body's tissues and organs of the oxygen they need to stay healthy.

Unlike normal RBCs that last about 4 months in the bloodstream, fragile sickle cells break down after only about 10 to 20 days, which usually causes anemia. Anemia (pronounced: uh-nee-mee-uh) is what happens when the body's number of red blood cells (or amount of hemoglobin) falls below normal. People who are anemic often feel weak, tire more easily, and may appear "run down."

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People with sickle cell anemia can also experience complications from impaired blood circulation and infection-fighting problems. These include a higher risk of certain infections and stroke as well as a condition called acute chest syndrome, which is caused by inflammation, infection, or occlusions (blockages) of blood vessels in the lungs by sickled cells.

Sickle cell anemia is not contagious, so you can't catch it from someone else or pass it to another person like a cold or an infection. People with sickle cell anemia have inherited two sickle cell genes, one from each parent. A child who has inherited the sickle cell gene from only one parent will not develop the disease, but will have sickle cell trait. People who have sickle cell trait don't have sickle cell anemia and usually don't have any signs of the disorder, but they can pass the sickle cell gene on to their own children.

Because people with sickle cell trait don't have the disease, they may never discover that they carry the gene. That's why it's recommended that teens who are unsure of their sickle cell status ask their doctors about testing.

The National Institutes of Health (NIH) recommends that all newborns be screened for sickle cell disease, and testing at birth is now required in almost every state. This helps infants with sickle cell anemia get the care and treatment they need right away.

Signs and Symptoms

Teens with sickle cell anemia may develop jaundice (pronounced: jon-dis), a condition that results from the high rate of red blood cell breakdown. Jaundice can cause a person's skin and whites of the eyes to develop a yellowish tint.

People with sickle cell anemia also may have bouts of severe pain in the chest, stomach, arms, legs, or other parts of the body. This is caused by sickle cells blocking blood flow through the small blood vessels in those areas. Feeling tired and having trouble fighting infections are also common among teens with sickle cell anemia, and they may grow more slowly and reach puberty later than other teens.

Periods of pain are commonly referred to as pain crises, which vary in their severity, how often they happen, and how long they last. Whereas one person may have only one sickle cell pain crisis a year, another may experience them more often. Crises can be brief or last hours, days, or even weeks. Sometimes pain can be severe enough to require treatment in the hospital. Symptoms can develop in any body organ or tissue and include aching arms, legs, hips, and shoulders.

When people with sickle cell disease get acute chest syndrome, they may have severe chest and abdominal pain, fever, cough, and trouble breathing.

What Can Doctors Do?

To diagnose sickle cell anemia, doctors use a special blood test called a hemoglobin electrophoresis (pronounced: eh-lek-tro-fuh-ree-sis) to look for sickle hemoglobin in a person's blood.

It is possible for some people to be ill enough to die from the disease (although most young people with sickle cell anemia don't die). Doctors can provide treatments that help prevent complications from the disease, though. Folic acid, a vitamin that helps the body produce new red blood cells, is often prescribed for teens with sickle cell anemia. Pain medications help relieve the symptoms of crises. And kids and teens who have sickle cell disease should take penicillin or other antibiotics to help prevent infections. Drinking lots of fluids and avoiding extreme cold or heat can help prevent crises.

Some crises can be managed at home with pain medicines, rest, and extra fluids. But if a crisis is especially intense, a teen may need to go to the hospital for intravenous (IV) fluids and stronger pain medications.

Many teens with sickle cell anemia occasionally need to get transfusions of healthy red blood cells to help carry oxygen to the tissues of their bodies more effectively and treat complications. A few may need transfusions regularly.

Scientists are constantly researching ways to help people with sickle cell anemia. Several new treatments, such as the drug hydroxyurea, have helped reduce painful crises and episodes of acute chest syndrome for adults and kids with sickle cell. Bone marrow transplant, a complex and risky procedure, is the only cure for sickle cell anemia.

Scientists are also studying gene therapy as a treatment for sickle cell anemia. One day, it's hoped that doctors may be able to stop the disease by changing or replacing the abnormal gene that causes it.

What Can You Do to Stay Well?

With the right precautions, teens with sickle cell disease can do most of the stuff other teens do. To stay as healthy as possible, take these steps:

Teens with sickle cell disease may need to put some limits on their lives, but with the help of doctors, friends, and family, they can manage the condition and live their lives to the fullest.

Reviewed by: Robin Miller, MD
Date reviewed: September 2012

Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

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Related Resources
OrganizationSickle Cell Disease Association of America This group provides education, advocacy, and other initiatives to promote awareness of and support for sickle cell disease programs.
OtherSickle Cell Information Center The mission of this site is to provide patient and professional education, news, research updates, and sickle cell resources.
OrganizationNational Institutes of Health (NIH) NIH is an Agency under the U.S. Department of Health and Human Services, and offers health information and scientific resources.
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