Sickle Cell Disease: When Red Blood Cells Take a Different Shape

September is Sickle Cell Awareness Month—a chance to replace misconceptions with science and shine a light on a condition that affects millions of people worldwide.

So, what happens when your red blood cells decide to change shape?

🩸Think of red blood cells as tiny delivery vehicles. Their main job is to pick up oxygen in the lungs and deliver it throughout the body. Normally, they are soft, flexible, and disc-shaped, allowing them to squeeze easily through even the smallest blood vessels.

In sickle cell disease (SCD), an inherited change in the hemoglobin gene causes red blood cells to become hard, sticky, and sometimes crescent or “sickle” shaped. Instead of flowing smoothly, these cells can stick together and block small blood vessels, reducing blood and oxygen flow to tissues.

🧬 Sickle cell disease is inherited, meaning it is passed from parents to children. It is not contagious, so you cannot catch it from another person. There is also an important distinction between sickle cell trait and sickle cell disease. A person with sickle cell trait carries one sickle hemoglobin gene and usually does not have the disease itself, but knowing your status is important because two people who carry certain hemoglobin variants can have a child with sickle cell disease.

🚧 Those stiff, sticky cells can block blood vessels, creating what is known as a vaso-occlusive crisis. This can cause episodes of significant pain. But SCD is much more than pain. Repeated blood-vessel blockage and ongoing red-cell breakdown can contribute to anemia and complications affecting multiple organs, including the brain, lungs, kidneys, and heart. SCD is therefore considered a complex condition that requires ongoing medical care and monitoring.

💊 The good news: treatment is evolving

Treatment for SCD has come a long way. Hydroxyurea is an important disease-modifying treatment that can reduce complications, including painful crises. Blood transfusions may be needed in certain situations, and some patients may be candidates for stem-cell transplantation or newer gene-based therapies.

👶 Why early care matters

Early diagnosis and regular follow-up can make a major difference. Children with SCD may need preventive care, vaccinations, infection prevention, screening for complications, and appropriate treatment from an early age.

This is especially important because SCD remains a major cause of preventable illness and death in children in many parts of the world. WHO estimated that SCD contributed to approximately 81,100 deaths among children under 5 in 2021, highlighting the importance of early diagnosis and access to effective treatment.

❤️ Awareness is more than a month

Sickle Cell Awareness Month is a reminder that behind every diagnosis is a person—not simply a blood disorder. Understanding SCD helps reduce stigma, encourages earlier diagnosis, supports families, and promotes access to effective treatment. And perhaps the most important message is this: Sickle cell disease may change the shape of a red blood cell, but it should never define the person living with it. Science is moving forward, and awareness helps make sure that progress reaches the people who need it.