Sickle Cell Disease in Nigeria 2025
The World's Highest Burden — and What Lagosians Must Know

Nigeria's Sickle Cell Burden — The Largest in the World

Nigeria carries the world's highest burden of sickle cell disease (SCD). Approximately 150,000 infants are born with homozygous sickle cell disease (HbSS) in Nigeria every year — representing roughly 45% of all sickle cell births globally. An estimated 25–30% of the Nigerian population (approximately 40–50 million people) carry the sickle cell trait (HbAS).

This creates an enormous public health challenge: any two AS parents have a 1 in 4 chance of producing an SS child with each pregnancy. In Lagos, where the population density is highest and genetic mixing is extensive, sickle cell disease is a daily clinical reality across every age group.

Understanding the Genetics — Simply

Haemoglobin — the oxygen-carrying protein in red blood cells — is coded by two genes, one inherited from each parent. In sickle cell disease, a point mutation in the beta-globin gene causes haemoglobin to polymerise (solidify) under low-oxygen conditions, distorting red cells into the characteristic sickle shape. Sickled cells are fragile, obstruct blood vessels, and are destroyed rapidly — causing the disease's hallmarks.

Clinical Features of Sickle Cell Disease in Lagos

Painful crises

The most common and most feared manifestation — sudden, severe pain caused by sickled cells obstructing blood flow to bones, joints, and organs. In Lagos, crises are frequently triggered by: malaria infection (the most important trigger in the Nigerian context), dehydration, cold exposure (particularly air conditioning), physical exertion, and infection. Adequate hydration, malaria prophylaxis, and prompt treatment of infections significantly reduce crisis frequency.

Anaemia and its consequences

The chronic destruction of sickled red cells (haemolytic anaemia) causes the characteristic pallor, fatigue, and jaundice of SCD. Baseline haemoglobin in HbSS patients is typically 6–9 g/dL — below the normal range. Acute anaemic crises (aplastic crisis from parvovirus B19 infection, or splenic sequestration in young children) are life-threatening emergencies.

Organ damage

Chronic sickling damages multiple organ systems over time: the spleen (functional asplenia by age 5 — dramatically increasing infection risk, particularly from encapsulated bacteria); the kidneys (sickle cell nephropathy — a significant cause of chronic kidney disease); the brain (stroke occurs in 11% of HbSS children by age 20); the eyes (proliferative sickle retinopathy); and the heart (cardiomegaly and cardiac failure).

Management Available at Mascot Healthcare

• Genotype testing — haemoglobin electrophoresis (identifies AA, AS, SS, AC, SC) — same day
• Premarital genotype counselling — AS × AS couples counselled on options
• FBC and PCV monitoring — baseline haemoglobin and crisis detection
• Folic acid prescription — 5mg daily reduces haemolysis
• Malaria prophylaxis and prompt treatment — most important crisis prevention in Lagos
• Acute crisis assessment and IV fluid support
• Hydroxyurea management referral — to SCD specialist centres where indicated

About the author: Dr. Adebayo Okonkwo is a General Practitioner at Mascot Healthcare, Akoka, Lagos. All statistics cited in this article are from WHO, FMOH Nigeria, and peer-reviewed journals — with sources available on request.