Family history and ancestry are factors that increase the risk of<unk> . Depending on family history, if a person's parents or grandparents had<unk>  major or intermedia, there is a 75% (3 out of 4) probability (see inheritance chart at top of page) of the mutated gene being inherited by an offspring. Even if a child does not have<unk>  major or intermedia, they can still be a carrier, possibly resulting in future generations of their offspring having<unk> . Another risk factor is ancestry.<unk>  occurs most often in people of Italian, Greek, Middle Eastern, Southern Asian, and African ancestry.
Beta thalassemia
Thalassemia
Delta-beta thalassemia
Alpha-thalassemia
Sickle cell-beta thalassemia
Paroxysmal nocturnal hemoglobinuria
Diamond–Blackfan anemia
Hereditary spherocytosis