What Is Sickle Cell Disease? The Complete Guide for Patients & Families

Educational information only. This guide does not diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider about sickle cell disease.

What is sickle cell disease infographic — what it is, how it's inherited, main types, symptoms and complications, and treatment and daily care

Sickle cell disease (SCD) is an inherited blood disorder affecting more than 100,000 Americans and millions of people worldwide. This complete guide explains what sickle cell disease is, how it is inherited, the different types, the symptoms and complications, current treatments, and how daily wellness fits in — written for patients, parents, and families.

What is sickle cell disease?

Sickle cell disease is a group of inherited conditions that affect hemoglobin, the protein in red blood cells that carries oxygen. People with SCD have an abnormal form of hemoglobin (hemoglobin S) that causes red blood cells to become stiff and curve into a sickle or crescent shape. These sickled cells break down early (causing anemia) and can block blood flow, leading to pain and organ damage.

How is sickle cell disease inherited?

SCD is passed down when a child inherits two sickle cell genes — one from each parent. A person who inherits only one gene has sickle cell trait and is usually healthy but can pass the gene to their children. Newborn screening now identifies most cases at birth.

Types of sickle cell disease

The main types include HbSS (sickle cell anemia, usually the most severe), HbSC, and HbS beta-thalassemia. The type affects how severe symptoms tend to be, though every person's experience is different.

Symptoms and complications

The hallmark of SCD is the pain episode, or vaso-occlusive crisis, when sickled cells block blood vessels. Other features include chronic anemia and fatigue, swelling of the hands and feet in children, frequent infections, and, over time, effects on the lungs, kidneys, eyes, and joints. To understand the pain itself, read What Does Sickle Cell Pain Feel Like? and Understanding the Sickle Cell Crisis.

How sickle cell disease is treated

Care has advanced dramatically. Standard options include hydroxyurea (which raises protective fetal hemoglobin), L-glutamine, crizanlizumab, blood transfusions, and — newly — gene therapies (Casgevy and Lyfgenia) that offer a potential functional cure but remain costly and limited in access. Pain management, infection prevention, and regular specialist care are the backbone of daily treatment.

Living well with sickle cell disease

Alongside medical care, daily wellness habits matter: consistent hydration, staying warm, managing stress and sleep, and nutrient-dense eating. See our Sickle Cell Wellness Playbook and Sickle Cell Diet Plan. The emotional side matters too — read The Hidden Emotional Toll of Sickle Cell Disease.

Frequently asked questions

Is sickle cell disease curable?

Gene therapy and bone marrow transplant can be curative for some patients, but access is limited. For most people, SCD is managed rather than cured.

What is the difference between sickle cell trait and disease?

Trait means one sickle gene (usually no illness); disease means two sickle genes and active symptoms.

How long do people with sickle cell disease live?

Life expectancy has improved substantially with modern care and continues to rise.

Sources

  • National Heart, Lung, and Blood Institute (NHLBI) — Sickle Cell Disease
  • Centers for Disease Control and Prevention (CDC) — Sickle Cell Disease
  • American Society of Hematology (ASH)

Written by the HalfMoon Labs team — a family navigating sickle cell disease firsthand. Educational content, not medical advice.