Its a severe anemia
A form of anemia
that affects many people around the world.
It results from a defective form of hemoglobin in the red cells, that results in deformation (sickling) and destruction of red cells, as well as blockage of small capillary vessels causing pain in bones, lung problems, possible strokes, severe fatigue and a shortened lifespan. It is inherited, but you need 2 defective genes from mom n dad.