Sickle cell anemia: the disease that makes red blood cells sickle-shaped and clog blood vessels

The disease is called sickle cell anemia

The disease in which red blood cells are abnormally shaped and can clog blood vessels is called sickle cell anemia, also known as sickle cell disease. It is a hereditary blood disorder that affects the function of hemoglobin, the protein in red blood cells responsible for transporting oxygen throughout the body.

What happens in the body?

In people with sickle cell anemia, a genetic mutation causes the hemoglobin to crystallize into long, rigid, and elongated structures when oxygen levels in the blood are low. This gives the red blood cells their characteristic crescent or sickle-like shape instead of the normal round and flexible form.

These sickle-shaped cells are stiff and less flexible than healthy red blood cells. As a result, they can get stuck in small blood vessels and cause blockages, which impairs blood flow and oxygen delivery to tissues and organs.

Symptoms and complications

The blocked vessels can lead to a range of complications, including:

• Pain episodes – sudden, intense pain attacks often referred to as "pain crises," which can affect the chest, abdomen, joints, and bones.
• Organ damage – prolonged lack of oxygen can harm organs such as the spleen, kidneys, lungs, and brain over time.
• Increased risk of infection – damage to the spleen weakens the immune system's ability to fight bacteria.
• Anemia – sickle-shaped red blood cells break down faster than normal, leading to chronic fatigue and weakness.

Heredity and diagnosis

Sickle cell anemia is inherited through an autosomal recessive pattern, meaning a child must receive the mutated gene from both parents to develop the full disease. The condition is most common among people with ancestry from parts of Africa, the Middle East, India, and the Mediterranean region, but it occurs worldwide. Diagnosis is usually made through a blood test that analyzes the shape of the red blood cells and the type of hemoglobin present.

Treatment options

Although there is currently no universal cure for all patients, several treatments can relieve symptoms and reduce complications. These include pain-relieving medications during crises, hydroxyurea to reduce the frequency of pain episodes, blood transfusions, and preventive vaccinations against infections. In some cases, a stem cell transplant may offer the possibility of a cure.

With proper medical care and regular follow-up, many people with sickle cell anemia today can live active lives despite their diagnosis.