Sickle cell disease occurs when a person inherits two abnormal copies of the haemoglobin gene from each parent.
The most common type is sickle cell anemia, it results in an abnormality in the oxygen-carrying protein haemoglobin found in red blood cells and this leads to a rigid sickle-like shape of cell.
Someone who has one gene from one parent have a trait for sickle cell, sickle cell trait are common among black people
Sickle – cell crisis are acute conditions occurring in patients with sickle-cell disease.
Studies have shown that sickle cell trait is found in eight percent of black people. Black people with sickle cell trait are at the risk of kidney disease.