A Patient's Guide to Sickle Cell Disease (SCD)

Published by Dr. Kasturi Mandal | Last updated: July 2025

Overview

Sickle Cell Disease (SCD) is a group of inherited red blood cell disorders. It affects hemoglobin, the protein in red blood cells that carries oxygen throughout the body. In people with SCD, the red blood cells become shaped like a sickle or crescent instead of being round and flexible.

An illustration comparing healthy round red blood cells to the crescent shape of sickle cells.
In SCD, red blood cells deform into a sickle shape, leading to various complications.

Causes & Types of SCD

SCD is caused by a genetic mutation in the HBB gene. A person must inherit two sickle cell genes (one from each parent) to have the disease. Inheriting only one gene results in sickle cell trait, where a person is a carrier but typically has no symptoms.

The main types include:

  • HbSS: The most severe form, often called sickle cell anemia.
  • HbSC: A generally milder form of SCD.
  • HbS Beta-thalassemia: A combination of sickle cell and thalassemia traits, with varying severity.

Symptoms & Complications

Symptoms usually appear in early childhood and can vary widely. Chronic symptoms include anemia, fatigue, and jaundice. Acute complications are more severe and can include:

  • Pain Crises: Sudden, severe pain in the chest, joints, or abdomen as sickled cells block blood flow.
  • Acute Chest Syndrome: A life-threatening complication with chest pain, fever, and difficulty breathing.
  • Stroke: A high risk, especially in children, if sickled cells block blood flow to the brain.
  • High Risk of Infections: Due to damage to the spleen.

Diagnosis & Treatment

SCD is typically diagnosed in infancy through routine newborn screening programs. The diagnosis is confirmed with a blood test called hemoglobin electrophoresis.

While a stem cell transplant is the only potential cure, treatment focuses on managing symptoms and preventing complications. Key treatments include:

  • Medications: Hydroxyurea is a primary medication used to reduce the frequency of pain crises. Other newer drugs and pain medications are also used.
  • Blood Transfusions: Used to treat severe anemia and help prevent strokes.
  • Preventative Care: Includes daily antibiotics for young children and all recommended vaccinations to prevent infections.
A compassionate doctor talking with a patient about their treatment plan.
Ongoing management with a hematologist is crucial for improving quality of life for those with SCD.

Outlook & Management

With modern treatments and comprehensive care, life expectancy and quality of life have improved dramatically. Many people with SCD now live well into their 40s, 50s, and beyond. Ongoing research into gene therapies offers significant hope for future cures. Management includes staying hydrated, avoiding extreme temperatures, and attending regular checkups.

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