An inherited blood disorder where red blood cells take an unusual sickle shape, causing pain, complications, and quiet resilience.
Sickle cell disease (SCD) is an inherited disorder of haemoglobin, the protein in red blood cells that carries oxygen. People with SCD make an abnormal form of haemoglobin (HbS), which causes red blood cells to become rigid, sticky, and crescent (sickle) shaped.
These misshapen cells can block blood flow through small vessels, causing severe pain (pain crises), tissue damage, and other complications. Like thalassaemia, it's not contagious, only inherited.
"Sickle cell disease" is an umbrella term for several genetic forms, each with different severity and treatment paths.
The most common and typically the most severe form. Both inherited haemoglobin genes are HbS. Most pain crises, complications, and need for transfusion.
One HbS gene and one HbC gene. Usually milder than HbSS, but still causes pain crises, eye complications, and other issues.
HbS combined with a thalassaemia gene. Severity varies, Sβ⁰ (no normal beta haemoglobin) is similar to HbSS; Sβ⁺ is generally milder.
Carrier status. Usually no symptoms and not a disease, but very important for family planning. Two carriers have a 25% chance of a child with sickle cell disease.
A pain crisis (vaso-occlusive crisis) happens when sickled cells block blood flow to tissues. It's the most common and most feared symptom of SCD.
Severe, sudden pain, often in chest, back, arms, legs, or joints. Patients describe it as "stabbing", "pounding", or "10 out of 10". Can last hours to days.
Dehydration, infections, sudden temperature changes, high altitude, stress, fatigue, alcohol. Sometimes no clear trigger at all.
If at-home pain relief isn't working, fever, chest pain, breathing difficulty, severe swelling, or new neurological symptoms. Sickle cell pain is a medical emergency.
Hydration (oral or IV), oxygen, pain relief (often opioids in ED), warm compresses, and rest. Trust the patient on their pain level.
Modern care has transformed outcomes, but lifelong monitoring matters.
Children with HbSS are screened annually (transcranial doppler). Prevention is highly effective.
Lung complication, chest pain, fever, breathing difficulty. Treated urgently in hospital.
Retinopathy (especially in HbSC). Annual eye exams catch it early.
Avascular necrosis (especially hips) from repeated reduced blood flow.
Living with chronic pain takes a real toll. Depression and anxiety are common, and treatable.
The spleen often doesn't work properly. Vaccinations and prophylactic antibiotics are essential.
Treatment focuses on managing symptoms, preventing complications, and, increasingly, pursuing cure.
The mainstay disease-modifying medication. Increases foetal haemoglobin production, reduces pain crises, hospitalisations, and need for transfusions.
Used during crises, for stroke prevention, before surgery, or in pregnancy. Chronic transfusion programs for high-risk patients.
Penicillin prophylaxis from infancy; pneumococcal and other vaccines reduce serious infections.
The only currently established cure. Most successful when a matched sibling donor is available.
The first gene therapies for SCD are now approved internationally. TASCA NZ advocates for NZ access.
Regular haematology follow-up, organ monitoring, mental health support, family planning, and peer support.
SCD is a serious lifelong condition, and one that people live full, meaningful lives with. The myth that it's a "death sentence" no longer fits reality.
TASCA NZ's peer network is full of sickle cell warriors who get it, and clinicians who'll fight for you.
Medical information here draws from authoritative guidelines and peer-reviewed literature, including:
